Dive into a fractions task where we spark student curiosity asking them to predict how many pieces of different shapes it will take to Cover It Up!

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]]>Last year, our district focused our system wide math content learning on number sense and numeration including counting and quantity principles, composing and decomposing numbers, addition and subtraction as well as multiplication and division while exploring these concepts through a spatial perspective. This school year, we continue to our work in number sense and numeration by deepening our understanding of whole number as well as introducing fractions.

Thus far, much of our work has been grounded in the ideas in the Paying Attention to Fractions document, the recently released Fraction Learning Pathway and some well known books including Uncomplicating Fractions.

Recently, Heidi Horn-Olivito and I were at a Math Knowledge Network meeting in Toronto where we were lucky enough to bump into Beverly Caswell, co-author of Taking Shape. Heidi and I were planning a task for an Uncomplicating Fractions book talk and Beverly was kind enough to help us out during the brainstorming process. As a group, we came up with some great ideas and here’s how it might look in different classrooms.

Before this lesson, you will want to print and cut out the following materials:

You can download the printable PDF template here.

Hold up the small square and the big square and ask them:

What do you notice? What do you wonder?

After allowing students some time to generate some things they notice and some wonderings, allow them to share with their neighbours. Finally, select some students to share with the entire group.

As usual, we will acknowledge all that the students share.

Our first wonder we will go with is:

How many small squares do you think it will take to cover the big square?

Since my 5-year-old daughter Taliah found this activity in my bag, I figured I’d try it out on her and her 3-year-old brother, Landon.

Here’s a video of what they did.

I was actually really impressed with how Taliah used her spatial reasoning skills to determine how many of the small squares she needed to cover the big square!

At this point, it might be useful to consolidate with students that the 4 small squares required to cover the big square can be considered 4 parts of the whole. These 4 parts can be called “fourths”. While we might use the word “quarters” when referring to fourths quite often, I would suggest holding off on that word at least for now.

If your students have had exposure to whole numbers on a number line, then this could be a great spot to relate the area model we are working with to a linear model using a number line.

You will notice that I have intentionally avoided the use of standard notation (i.e.: 1/4, 2/4) of a fraction to highlight the unit fraction of “1 fourth”. You can read more about the importance of the unit fraction through the work of Cathy Bruce and the Fraction Learning Pathway. Helping students understand that when we are working with fractions, we are counting a certain “unit” or equal partition of the whole. In this case, we are counting fourths as “0 one fourths, 1 one fourths, 2 one fourths, 3 one fourths, …” and so on. If students can recognize early on that they are counting fractional pieces in the same manner they would count candies, cheerios, or books, it would seem logical that they could better connect the idea of fractions as simply a unit of measure.

Over time, you might gradually move from a unit of “one fourth” to “fourths”:

And when students are ready, we can make a smooth transition from writing the unit in words to standard fraction notation.

In Ontario, this transition happens in Grade 4.

Next, I asked the same question, but this time with triangular pieces that are half the size of the small squares:

How many triangles would it take to cover the big square?

Here’s a video of what Landon did initially.

So, not quite what I was hoping for, but he did manage to cover the entire square using a combination of 4 triangles and 1 square. I thought that was pretty telling as to the spatial reasoning he was using in order to cover up the whole.

And, as children often do when another is receiving attention, Taliah copied his design initially.

However, as you’ll see in this video, Taliah determined the number of triangles it would take to cover the square by only placing 1 on the big square. She then visualized how many other pieces she would need coming up with an answer of 8.

I attempted to help her make the connection that 4 pieces of a whole are called “fourths” and 8 pieces of a whole are called “eighths”, but when she bumped her triangles off the square, her attention was lost. Will have to try to come back to this in one of the later activities.

Although I’m not set on a specific order of the next few tasks, I thought that sticking with a smaller square would be best for them despite there being more partitions (16 total).

So, the question now is:

How many of the really small orange squares will it take to cover the big white square?

Here’s a video of what Taliah and Landon did.

As you saw in the video, Taliah again used only one of the parts to determine how many it would take to cover the whole.

We even managed to make the connection between a whole partitioned into 4 parts being called “fourths” and when we partition the whole into 16 parts, we call them “sixteenths”. You may have also caught her say a “oneth” – referencing what I assume was the big white square. Makes me wonder whether we want to maybe use a bit of slang calling wholes “oneths” and halves as “twoths” (prounounced “tooths”). Worth thinking about, I think.

I then asked her to prove it by handing her a big pile of small squares (sixteenths).

Something worth noting is that in the Ontario curriculum is the fractional pieces students are expected to work with in each grade level.

For example, the specific partitioning mentioned in the following grades are as follows:

- Grade 1 – halves; fourths or quarters
- Grade 2 – halves; fourths or quarters; eighths
- Grade 3 – halves; thirds; fourths or quarters;

*specifying the use of more than one fractional piece (e.g.: one half; three thirds; two fourths or two quarters)**without**using numbers in standard fractional notation - Grade 4 – halves; thirds; fourths or quarters; fifths; tenths;

*specifying the use of standard notation and the use of the word denominator to represent the number of partitions of the whole for the first time in the curriculum - Grade 5 – denominators of 2, 4, 5, 10, 20, 25, 50, and 100
- Grade 6 – denominators of 2, 4, 5, 10, 20, 25, 50, and 100

In Grade 7 and 8 there are no explicit references to which denominators should be used, which suggest that students should be working to become flexible with any denominator.

With this said, by no means does the curriculum suggest that we hold students back from pressing their thinking. For example, while my daughter is not expected to work with sixteenths for quite some time, it is to my advantage as a teacher to press her for understanding when she is ready. I can certainly assess her on her progress based on her own learning needs, but should not formally evaluate her via a mark, grade or report card on this specific learning.

Interestingly enough, when I gave Taliah the whole partitioned into rectangular pieces, her visualization / spatial reasoning skills let her down.

She initially believes that it will take 16 to cover the white square. So, I toss a pile of blue rectangles at her and let her get to work. Here’s a video showing what she came up with.

I thought this task was a great example of how important concrete materials come into play when we are discovering new ideas in mathematics. Taliah was using her visualization skills to help guide her thinking earlier. Now that the number of partitions are increasing and the shape of the partitions are becoming more difficult to visualize for her, she is forced to go back to the concrete manipulative (cutouts of the shapes) in order to guide her thinking.

It would be really easy for me to walk away from this task thinking my kids have done some great work with fractions (and I think I’d be right). However, we are constantly leaving money on the table in our classrooms and I almost left some here in this case.

Next, I wanted to see if Taliah was thinking in absolute or relative terms. If she was thinking in absolute terms, she might believe that the green squares were **ALWAYS** fourths and the small orange squares were **ALWAYS** sixteenths. If she is thinking in relative terms, then she would know that the name of each piece would change based on what we were comparing it to. This is super heavy, so I wasn’t really expecting much.

Boy, was I wrong. Check out the video here.

As you see in the video, she seems to be able to think in relative terms. Something that is so important for students as they develop their fractional, multiplicative and proportional reasoning skills over the next handful of years.

Check out all of the great samples of student thinking shared from around the web! Keep them coming!

First, Lisa Burke submitted a video of her son, Henry engaging in some pretty awesome fractional thinking:

Then, we had Ms. Cruickshank from John Campbell Public School submit a great video series of student thinking. Definitely worth the 9 minute watch:

Thanks to everyone for submitting student work samples. Would love to see more!

I find that teachers in junior and intermediate grades tend to want something a bit more “robust” and they might consider jumping straight to this image grabbed from Marian Small’s Uncomplicating Fractions book:

Many teachers I’ve worked with have found that students actually struggle quite a bit with this problem. Often times, what students miss in this particular visual is to define the whole. Some students will see the entire “big” square as the whole, while others might look at each fourth of the big square as a whole.

The good part is that as long as the student clearly articulates the whole they are referring to, the name of their fractional pieces can be different than another student in the class.

For example, if one student says the rectangular pieces are “thirds”, then they should also be able to articulate that we can visually see 4 wholes since you could fit 12 thirds over the entire image.

As you can imagine, playing with the idea of comparing fractions and equivalent fractions could easily be tied in as well as extending to operating on fractions.

Some other interesting visuals to use and address such as:

Even in older grades, it would be worth giving students the cut out of this visual so students can predict and then prove by folding and/or cutting. They’ll find out in different ways that each partition is a fourth.

Here is another to consider using:

Thinking about using this task in your classroom? Download the printable PDF below:

Would love to hear how you use these tasks in your classroom. Let us know in the comments!

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]]>Recently, Jon Orr and I received some descriptive feedback from James Francis from Knowledgehook after watching us co-present a workshop titled “Making Math Moments That Matter” at the GECDSB Math Symposium. After sharing some of the pieces he really enjoyed, he also shared some constructive criticism: What I personally didn’t enjoy was the really general […]

The post Why I Ask Students to Notice and Wonder appeared first on Tap Into Teen Minds.

]]>Recently, Jon Orr and I received some descriptive feedback from James Francis from Knowledgehook after watching us co-present a workshop titled “Making Math Moments That Matter” at the GECDSB Math Symposium. After sharing some of the pieces he really enjoyed, he also shared some constructive criticism:

What I personally didn’t enjoy was the really general “what did you wonder” questioning that I have experienced in other workshops as well. I feel like if a teacher asked me to notice and wonder, I would be annoyed knowing that it is very likely this task will have nothing to do with what I come up with, so why waste my energy? When people ask for your opinion and they don’t do anything with it, they might become resentful that you would even ask in the first place.

If the idea of “Notice and Wonder” is new to you, check out Annie Fetter from the Math Forum who has done a great job developing this idea and sharing it with the math world.

This isn’t the first time I’ve had workshop participants question the utility of asking students to notice and wonder. Sometimes, I can see a few eyes roll and every now and again I come across some who are reluctant to participate in this portion of the task. However, I feel that this portion of the lesson can often make or break a task. Let’s explore why.

If you’ve ever been to workshops led by Jon and I, we make a significant effort to get participants talking as much as possible in non-threatening situations just as we would when working with students. For example, in this past workshop, we asked the group to think about memorable moments in their lives and the math moments they remember from their educational experience as a student in order to share with the group. Taking the time early on in a math lesson for students to talk and share their thoughts where the stakes are low can be helpful to build trust and confidence, while also showing them that we value their voice regardless of their ranking in the invisible – yet very apparent – math class hierarchy. A well led notice and wonder discussion can really go a long way to creating a classroom of discourse that will hopefully over time, develop into mathematical discourse.

Not only does asking students to notice and wonder give them an opportunity to have a non-threatening discussion with their peers, but it also helps to feed their natural curious mind. I will never forget the first couple of years attempting to use Dan Meyer-style 3 act math tasks in my classroom and how often I felt like the lessons were a flop. What I eventually realized was that I didn’t take enough time to spark the curiosity in my students by developing the storyline of the problem. After taking much time to reflect on what my lessons were missing, I realized that I wasn’t giving my students a reason to get excited about the task or give an opportunity to engage in any thinking until they were ready to actually solve the problem. They knew that I was going to show some sort of video or photo and I would then tell them what to do next. When we ask students to notice and wonder, we are asking them to think, discuss and share their thinking which builds more interest and anticipation for more. And while the teacher should always have a specific direction in mind for where the learning will lead, we can still make each student feel like a contributor to the class discussion and the direction of their learning by writing down their noticings and wonderings for possible extensions and for future lessons.

That said, asking students to notice and wonder isn’t something all students will enjoy at first. Some have said they “feel silly” or that “this is stupid” likely because they aren’t accustomed to being involved in the development of a problem and thus, they aren’t quite sure what they are supposed to do. However, I think that this temporary struggle can be a good thing. One of the reasons I want students to notice and wonder when they think about mathematical situations is so they aren’t so dependent on me telling them everything they are supposed to see or do in math class. Over time, many students learn to enjoy the process however like in other areas of life, some may not. An observation I have made over time is that I often find that my “go-getter” students are the largest group of students who hold out the longest on the notice and wonder – much like workshop participants who dislike the process – because they just want to get to the point. However, if you were to watch a movie or read a book that jumps straight to the conclusion, you’d be pretty let down. We have come to expect that sort of uninspiring and emotionless experience in math class and it shouldn’t surprise me when students push back when I try to push them to get involved in the development of the problem.

Something Jon and I have discussed in the past is about how most teachers would likely fit in the “go getter” category since we were likely the students who understood the game of school and specifically, how to succeed in math class. It can be easy for us to believe that all students think and feel the same way we did in the math classroom. However, the reality is that many students do not feel as comfortable or confident as many of their teachers may have when they were in math class. When our experiences learning math are very different than that of many of the students in our classroom, it is easy for us to develop an unconscious bias. This might influence our thinking around whether or not there is a need to create non-threatening opportunities for students to talk and discuss in math class.

Interestingly enough, it is not uncommon for those who oppose the notice and wonder portion of a lesson to also become uncomfortable making predictions when required information is withheld. For example, if I ask a group to make a prediction about how many passenger seats there are in the plane below, some get anxious and a bit scared to throw out a prediction that may be way off despite the fact that they don’t have enough information.

While I don’t have a definitive answer as to why the high achievers in my class most commonly tried to side-step the notice, wonder and predicting portions of the lesson, my hypothesis is that this process may be perceived as a threat – either consciously or unconsciously – to their position in the math class hierarchy. By no means is it my intent to make any group of students feel uncomfortable, but I do believe that this protocol assists in the levelling of the playing field. By providing more opportunities for all students to participate and feel as though they have something valuable to offer the group, we are taking steps to remove the math class hierarchy and build a learning environment that is equitable for all students.

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]]>Join our mission to engage 1,000,000 students around the globe in a joyous, uplifting mathematical experience with Exploding Dots!

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]]>If you’ve ever checked out my 3 act math tasks, you will quickly notice that I am all about **sparking curiosity** in order to **fuel sense making** for our students. Well, Exploding Dots nails the curiosity AND sense making pieces of the puzzle and with Global Math Week coming up next week, what better time than now to jump right in!

It was only a few months ago when I really started exploring this idea called **Exploding Dots**, but I was immediately intrigued. Since then, I have fallen in love with this amazing story of mathematics that James Tanton and The Global Math Project are hoping to spread to over 1 Million students around the globe.

Why not join the rest of the world next week for a 15 minute exploration or days of math fun with **Exploding Dots**. Best of all, there are full technology, low technology and even no technology versions to enjoy! Registration is simple because it only involves a pledge of participation and you can do it in under a minute here.

Enough of me pitching this “joyous and uplifting mathematics experience for all.” Let’s get your feet wet!

DISCLAIMER: READING ON IS LIKE SPOILING THE END TO A MOVIE. I highly recommend just jumping into the first Exploding Dots activity (called an “Island”) instead of reading on. However, if you aren’t going to take the time to give it a shot, I’d rather you read in order to share this great experience with your students.

Watch this video.

In the “silent solution” style video, you are exposed to the “2-to-1” machine (written 1 <-- 2) and are left hanging at the end when they ask you to figure out how many dots would be required in the rightmost box to have a code of *10011*.

So. Give it some thought. Maybe draw it out?

It’s never too late to dive into Island 1 and see if playing with the “1 <– 2” machine can help construct some understanding AND I promise you’ll have fun doing it.

For those of you who still won’t go and just dive in to play with the Exploding Dots app, let’s have a closer look at the first island, Mechania.

I’d like to share a quick video at the beginning of the first Island, called “Mechania” to assist you with your exploration.

After watching the video, the **Exploding Dots** app has you jump into the action asking you questions that press you for understanding. It might seem tricky at first, but remember: this activity isn’t about finding the right answer; it is about sparking curiosity, using strategic competence and building a productive disposition towards mathematics.

Here’s a look at the first two questions:

Pretty simple, right?

The Exploding Dots app starts with a very low floor and has an extremely high ceiling.

Here are the next two questions to explore with the 1 <– 2 machine:

Before you know it, you’ll be tacking problems like this one:

Wait a second. Didn’t the question posed in the video at the beginning of this post look an awful lot like what we just did in the previous question?

Here it is again:

Do you think you can try it now? Go ahead. Take your time.

Heck, why not try the 1 <-- 2 machine in the Exploding Dots app to help you?

Here’s a strategy someone might use to answer the question:

Can you find a more efficient way?

Aside from the fact that curiosity is surging, strategic competence is spewing and productive disposition is oozing at all time levels, you *could* consider exploring how the 1 <– 2 machine helps computers work. While some may have picked up that the 1 <– 2 machine is the same language that a computer uses, many others may not. The base 2 number system – a series of “on” and “off” digits – is extremely important in computer science. It is the language computers speak!

While you might think the fun is over, it’s just begun as you continue through this activity to explore the 1 <-- 3 machine as well as the 1 <-- 10 machine. Something you may notice rather quickly with the 1 <– 10 machine is that it is the “base 10” number system; the standard number system we use in our everyday lives.

Once you arrive at the Exploding Dots landing page, you’ll notice that there are quite a few activities (called “Islands”) for you to explore. I believe the best experience would involve students diving in from the beginning, however it might be useful for you to see where students will eventually land as they traverse through each of the Islands.

Since we explored the first island, Mechania in detail above, let’s take a quick look at each of the remaining 5 islands that are active on the Exploding Dots website to expose you to the other mathematical connections that can be made from Kindergarten through Grade 12.

After students explore and discover in Mechania, students will be brought to Insighto to begin unpacking the conceptual pieces that make the different dot machines work.

After building some of the conceptual understanding from the Insighto Island, students will be brought to Arithmos to begin applying our understanding of the 1 <-- 10 machine to addition and later, multiplication. The logic students can build using the dot machines really helps them grasp an understanding of place value and why standard algorithms work.

Have a look at a sample of addition:

And later on, multiplication:

As students work through the Island of Arithmos, they will eventually arrive at commonly used or “standard” algorithms for addition and multiplication wrapped up with a nice bow of conceptual understanding.

What? Integers before subtraction?

YES! When students arrive on the Island of Antidotia, they will immediately be introduced to “dots” and “antidots” which intuitively build an understanding of integers prior to looking at subtraction. This is because the concrete and visual representations for both will look identical.

Students will eventually be led to standard algorithms we commonly see in elementary school for subtraction while also building an understanding of integers and the zero principle.

Get ready to look at division in a brand new light. Imagine possibly getting to a point where you could pretty accurately divide large numbers by focusing just on digits in each place value column.

While I love the entire exploding dots experience, I think the conceptual understanding this particular activity builds in students around division alone is worth the time and effort!

Ok, secondary math teachers. This is the island you’ve been waiting for. This is the reason why you put in the time and effort with your senior secondary math students with the Exploding Dots experience.

Have you ever imagined multiplying or dividing in any base in a way that was not only procedurally possible, but also conceptually understandable for students?

Well, here’s your opportunity. Students can play with big, long, BEAUTIFUL polynomials and they can quickly discover how to divide, handle remainders including The Remainder Theorem and multiplication of polynomials.

Ready to explore?

If this blog post hasn’t inspired you to join us during Global Math Week with Exploding Dots, then clearly I have done you wrong.

Take the time to register your class and spread the word with your colleagues.

Together, we can reach over 1,000,000 students!

Or, 0111011100110101100101000000000 students if we use the 1 <– 2 machine.

Or, 2120200200021010001 students if we use the 1 <– 3 machine.

Or, 323212230220000 students if we use the 1 <– 4 machine.

Or…

Ok, I think you get the point.

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]]>Learn the Progression of Division where we will explore fair sharing, arrays, area models, flexible division, the long division algorithm and algebra.

The post The Progression of Division appeared first on Tap Into Teen Minds.

]]>Over the past school year, I have had an opportunity to work with a great number of K to 8 teachers in my district with a focus on number sense and numeration. As a secondary math teacher turned K-12 math consultant, I’ve had to spend a significant amount of time tearing apart key number sense topics including the operations. While I often hear teachers concerned about multiplication skills of their students, an operation that doesn’t come up too often in discussion is **division**. However, what I found interesting this year was how much of a struggle it was for teachers to attempt representing division from a conceptual standpoint instead of simply relying on a procedure. After spending quite some time diving into division independently as well as collaboratively with educators through workshops, I will attempt to share what I believe to be some pretty important pieces along the **progression of division**.

Disclaimer:

This is by no means a complete progression and would welcome other pieces in the comments that I could add in to build on this post over time. I have found thinking about these pieces as pivotal in my own understanding of how division is constructed over time, but will likely continue changing as my own understanding deepens.

I would recommend first exploring the progression of multiplication prior to jumping into this post focusing on the opposite operation, division.

Before we begin diving into division, I feel it is important for students to be very efficient with unitizing which I discuss in a separate post with counting principles.

To summarize, **unitizing** is:

Understanding that every quantity we measure is relative to another pre-measured group we call a unit. For example, our base ten place value system.

Before students can successfully unitize, they must be able to count via one-to-one correspondence. For example, a student successfully counting a group of items, one at a time.

After learning **one-to-one correspondence** and working on other principles of counting and quantity, teachers can begin encouraging students to skip count by 2s, 3s, and so on. This might be considered the beginnings of having students unitize implicitly. For example, by counting by 2s: 2, 4, 6, 8, and so on, students are counting up by a group larger than 1. Over time, students can begin counting the groups of 2 (or whatever unit they are skip counting by) with their fingers to really bring out unitizing explicitly.

Or, maybe in groups of 3 (i.e.: 3-to-1 correspondance):

This ability to create equal groups and keep track of the count is important for students to really begin their journey towards **division**.

Once students are able to count groups of 10, they are not only well on their way down the progression of division, but also on their journey to conceptually understanding our base ten place value system.

Something that comes quite natural to young children is the ability to **fair share** a group of items. For example, sharing a handful of candies between siblings isn’t something that is typically taught explicitly, but rather students develop this sense of fairness through play.

Prior to attempting to formalize division as an operator, students should have extensive experience fair sharing items amongst friends, both concretely (by sharing to real people like their classroom peers) and when ready, visually/pictorially (by sharing to groups organized on their desk, on paper or on a whiteboard).

An example of such fair sharing is given in the Ontario Grade 2 Mathematics Curriculum in the Number Sense and Numeration strand:

represent and explain, through infestation using concrete materials and drawings, division as the sharing of a quantity equally (e.g., “I can share 12 carrot sticks equally among 4 friends by giving each person 3 carrot sticks.”);

While most students will likely fair share the carrots through **one-to-one correspondence** (i.e.: grabbing one carrot at a time and giving it to one of the friends), something to note here is that they are engaging in an early form of **repeated subtraction**. In other words, the student is repeatedly subtracting one carrot from the total and then will count how many each friend has once they run out of carrots to share.

As students become more comfortable with the idea of fair sharing, they may begin unitizing the amount of carrots that they share fairly. For example, in this same situation, an experienced student may notice the large group of carrots and begin to share two carrots at a time. You can understand why skip counting backwards can be helpful in completing this task.

Once students are comfortable with fair sharing using repeated subtraction in units of 1 or more, we can begin formalizing this idea as an operation we call **division**.

In the Ontario curriculum, we begin formalizing division in Grade 3 using tools and strategies up to 49 ÷ 7:

And extend our work with division in Grade 4 to using tools and mental math strategies:

Something that is not stated explicitly in the Ontario mathematics curriculum and can easily be overlooked by elementary math teachers is that there are two types of division: **partitive** and **quotative**.

The first type of division we will explore is called **partitive division**. This type of division is possibly the first type of division students intuitively experience when they are young by sharing a group of items with their friends as we did earlier by sharing 12 carrots amongst 4 friends. In other words, partitive division occurs when a scenario requires a student to divide a set of items into a given number of groups, where the number of items in each group is unknown.

To give another example, we could look to the following question from Alex Lawson’s book, What to Look For, where a student is asked to answer the following question:

You buy 15 goldfish. You are going to put them in 5 jars evenly. How many goldfish will you put in each jar?

Since the student knows how many jars he must divide the 15 fish into, students might fair share by units of 1 or more at a time until all the fish are shared.

After viewing the visualization above of the student distributing the goldfish by assigning one fish to each bowl at a time, it becomes more obvious as to why we also call partitive division “**fair sharing**”.

The second type of division we will explore is commonly known as **quotative division**. This type of division occurs when a scenario requires a student to divide a set of items into groups with a given amount in each group, where the number of groups is unknown.

To rearrange the previous question as an example of quotative, we might ask the student this question:

You buy 15 goldfish. You are going to put them in jars, with 3 in each jar. How many jars will you need?

Since a **quotative division** problem tells the student how many items should be in each group, it would seem reasonable to assume that the student would unitize the 15 goldfish into units of 3 until all of the goldfish have been used and then count the number of groups created. When a student completes this problem, possibly using cubes or square tiles to represent each of the goldfish, they are implicitly using repeated subtraction to take away 3 goldfish at a time from the total of 15.

The visualization here shows the student **measuring** groups of 3 fish and then **repeatedly subtracting** those groups from the set of 15 fish until there are none left. Hence the names “**measured**” and “**subtracting**” division.

In summary:

- Number of groups is known; and,
- Number in each group is unknown.

- Number in each group is known; and,
- Number of groups is unknown.

While I personally am less concerned about teachers being able to name these two types as quotative and partitive, it is important that teachers are aware that two types exist to ensure that they are exposing their students to contexts that address both of these types.

When using division without context like fair sharing carrots or placing goldfish in jars evenly, the student can decide whether to use a partitive or quotative strategy based on what they are most comfortable with. While convenient, a potential pitfall may arise if students divide procedurally using only one type of division while ignorant to the fact that another type of division exists.

For example, if a student were to model *56 ÷ 8* using square tiles, a student could approach this using **partitive division** by fair sharing the 56 tiles evenly into 8 groups like this:

Or, the student could choose to model this problem by using **quotation division** by repeatedly measuring out groups of 8 and subtracting them from the set of 56:

If students are given large quantities of straight calculation problems and only few contextual problems like the goldfish problem shared above, they may not build the necessary fluency to approach contextual problems successfully when they do arise.

You’ll probably notice that regardless of which type of division students are using, they often make circular piles of the item they are working with. I believe this to be an important stage in the progression as it seems fairly intuitive to simply create your groups without ordering or organizing the items in each group.

As the dividends and divisors that students work with get larger, it can be helpful to think about organizing the items to help promote unitizing as well as building conceptual understanding and procedural fluency of division using **arrays**.

For example, if we look at an extreme case of dividing *120 ÷ 8* using individual square tiles, we can still identify partitive and quotative division:

While I don’t want students spending too much time trying to divide large dividends using square tiles, it **could** assist in showing students why base ten blocks are helpful.

Just like with multiplication, I think students should have a significant amount of experience dividing with arrays up to 81 ÷ 9 if you hope to help them conceptually understand division with dividends greater than 100.

Not sure what is going on in the above image? Be sure to check out the progression of multiplication before going on where we explicitly address arrays and area models which we will be diving into pretty quickly here.

It doesn’t take long for students to become annoyed by trying to use square tiles to represent division with large dividends. Thankfully, as we saw in our Progression of Multiplication post, we can turn to base ten blocks to cut the hassle.

For example, if a student wants to model 120 ÷ 12, they could use 1 hundred flat and 2 ten rods to represent 120 and 1 ten rod and 2 units to represent 12. The representation would be similar to multiplication, except in this case, you have one factor (12) and the result (120) and you must find the unknown factor:

It is easy to see the benefit of using base ten blocks when dividends get large. Instead of using 120 individual square tiles, we can use 3 base ten blocks to represent the same dividend. I intentionally selected a fairly easy example to begin with in order to allow students the opportunity to become familiar with dividing with concrete materials. While it might not seem obvious at first, dividing becomes increasingly difficult when more challenging examples are attempted.

Let’s try another example like 112 ÷ 8.

Your dividend will consist of 1 hundred flat, 1 ten rod, and 2 units, while your divisor consists of 8 units.

As students are given opportunities to explore and discover, they will make observations and I would encourage them to discuss these observations with their peers to come up with rules. For example, some students come to realize that you must convert hundred flats to ten rods when working with a divisor with a value less than 10. Other students may come to realize that since multiplying two numbers yields a rectangle, that we must continue “trading down” the base ten materials until you can make a rectangle with the dividend with one factor being the divisor.

This experience might look something like this:

While I will attempt to be as clear as possible in this post, it is important to note that students will need a significant amount of experience at each stage of the progression. Do not attempt to rush or you will find both you and your students frustrated.

Due to a shortage of concrete base ten materials or to make life a bit easier, students may begin gravitating to digital base ten block manipulatives. While it might seem easier to just jump straight to digital manipulatives, I don’t recommend rushing to this stage as students should really have the opportunity to physically manipulate the base ten materials prior to moving to a digital alternative.

When students have had significant experience manipulating physical base ten materials, you might consider using the Number Pieces iOS app or the web-based version from Math Learning Center.

While using a digital manipulative can be more efficient for a student who is experienced using physical base ten blocks to model division with 3 or more digit dividends, it can be a huge hinderance for students who have not been given an opportunity to build their conceptual understanding in this area.

When I deliver workshops specific to the progression of division, I find teachers quickly jump to the conclusion that dividing with base ten blocks is simply too difficult and unnecessary.

However, I believe quite the opposite.

I agree that using base ten blocks is definitely not the most efficient method a student should use when trying to divide two numbers, but they are very useful for building a conceptual understanding of division as well as a unique opportunity to build strategic competence by problem solving their way to a solution. Less obvious is the experience students are gaining around conversions when they trade in a hundred flat for 10 ten rods, a ten rod for 10 units as well as implicitly building the foundation for factoring quadratics – a grade 10 concept here in Ontario – all the way down in grade 5.

Let’s check out another example: 189 ÷ 9

Check out the conversions from hundreds, to tens, to units.

We could go ahead and rush to the **long division algorithm**, but why would we want to rob students of the opportunity to look at mathematics as a puzzle waiting to be solved?

Still want more practice?

Try 221 ÷ 13 using base ten blocks or Number Pieces app.

Once you’re done, see if your result looks something like this.

Like anything we do in mathematics to build conceptual understanding, we don’t want the learning to stop there. Ultimately, we hope that the rich learning experiences we offer our students will begin to solidify by creating procedural fluency and automaticity. The next step on our way to the long division algorithm is the **area model**. This model is very useful when dividing and helps set us up for a clear connection to the long division algorithm, which is our end goal for this progression.

If we think about the distributive property from our multiplication post, you’ll remember that we could use this property by “splitting the array”. We can do much the same with division and it is convenient to do so by using open area models. In other words, rather than using square tiles or base ten material to represent an array for multiplication or division, we will use a not-to-scale rectangle in its place. A little less precise, but still gives us the same visual that an array can offer leaving our minds to visualize the rest.

Let’s have a look at *195 ÷ 15* using an **area model** to represent division.

When drawing an area model for division, students are able to essentially unitize their own “chunks” to partitively (divide x items into 15 groups) or quotatively (divide into x groups of 15) approach this division problem.

In this case, I’ll give an example of a student who decides to approach this quotatively by repeatedly subtracting groups of 15 from 195 until running out of items:

Wow, that isn’t a super efficient way to go about things. However, over time, your students may begin to notice more efficient approaches like the example below where a student notices that when there is 150 remaining, that is 10 times larger than 15.

If we’ve taken away 3 groups of 15, then another 10 groups of 15, we know that we’ve taken away 13 groups of 15 total.

Let’s try another one.

Have a look at a possible approach to solving 888 ÷ 24.

While I’m a huge advocate for using context in math class, I’ve kept things fairly contextless for the majority of this post. However, I want to explicitly show that whether there is context or not, these strategies to promote students conceptual understanding and procedural fluency with division are very helpful.

Let’s have a look at a problem with some context involving a pool.

A pool has a width of 14 m and an area of 700 metres-squared.

What is the length?

When using open area models, you’ll find students will quickly jump on the use of friendly numbers like multiples of 10, for example.

You may notice that when I’m using area models, I’m using a symbolic approach to keep track of the repeated addition. That method is used in a number of different places with different names. In Ontario, the Guides to Effective Instruction call that strategy “**Flexible Division**”, since it is very similar to the **long division algorithm**, but puts the power in the hands of the student to select how many groups of the divisor to subtract with each iteration.

Eventually, students can opt to skip drawing the **open area model** and using what looks to be the long division algorithm or a variation like flexible division in order to solve division problems without a calculator.

As students enter grade 9 and 10, they will be offered an opportunity to put the conceptual understanding and strategic competence they have been developing through division with arrays and area models to use.

When common factoring, students will encounter problems like this one:

A pool has a width of 3 metres and an area of 12 times a number.

What is the length?

It could be helpful for students to create themselves an open area model as we did in the previous example:

When moving from working with multiplication and division to algebra, we rename our concrete materials from **base ten blocks** to **algebra tiles**. Instead of units, ten rods and hundred flats, we use very similar tools, but call them units, x-rods and x-squared flats. It should be noted that a hundred flat could also be called a “10-squared” flat.

So, instead of using ten rods like we use with base ten blocks, a student may opt to draw in “x-rods” representing the missing number, x. While there are many ways to approach this problem conceptually, I often see students approaching this additively by adding groups of 3 x-rods until reaching an area of 12 x-rods total. Students might also keep track of their work by using repeated subtraction (or flexible division) to the right of their area model:

Recall our work using base ten blocks and arrays for division earlier in the progression. In our next example, we will look at a similar context using the dimensions and area of a pool to show how all that conceptual work back from grade 5 and 6 can be utilized in Grade 10 to factor both simple and complex trinomial quadratics.

In this example, we’ll explore the following:

A pool has an area of 3x^2 + 11x + 6.

What are the dimensions?

While many students in grade 10 struggle with the idea of factoring quadratics, they may not experience the same level of struggle if they have any experience multiplying and dividing with base ten blocks.

When factoring quadratics, students can simply grab the number of tiles that represent the quadratic they are factoring and then attempt to create a rectangle. Once they find a complete rectangle, they can quickly identify the factors that yield that area. If you can’t make a rectangle, then you know your quadratic cannot be factored with integer coefficients.

Let’s have a look:

Factoring quadratics with algebra tiles is actually much easier than dividing with base ten blocks due to the fact that you are not required to convert from hundred flats to ten rods and ten rods to unit tiles! Who would have thought that grade 5 was tougher than grade 10?

As I’ve mentioned in previous posts, there is definitely an argument for starting new ideas in mathematics with concrete manipulatives, slowly moving towards visual (or drawn) representations and finally to abstract representations that use symbols to represent the concrete. Although the name suggests that the concrete stage fades away over time, it is important to note that we should be returning to concrete manipulatives with every new layer of abstraction.

For example, when we first introduce division, we might be working with two digit dividends and single digit divisors. Concreteness fading for this idea might look something like this:

When progressing to three digit by one digit division, the stages of concreteness fading may look something like this:

Years later, when factoring complex trinomials in grade 10 academic math courses, the stages of concreteness fading might look something like this:

So while this progression of division may not be “the” progression, I certainly hope it shines some light on how important understanding division conceptually through the use of concreteness fading is for promoting the development of a complete understanding for our students.

Interested in checking out some 3 act math tasks that can be used in conjunction with the progression of multiplication and division? Be sure to check out the tasks below:

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]]>It's easy to forget why we integrate technology in our math class. Let's use the SAMR Model to plan our lessons using technology with purpose and intent.

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]]>While in Austin, Texas for iPadpalooza back in 2014, Tim Yenca (@mryenca) was kind enough to give me a lift to dinner with a group of presenters. After noticing a parking lot with a sign advertising $5 parking, we found ourselves a spot and made our way to pay the fee.

After looking around the lot for a payment machine, I ended up back at the sign near the entrance.

Have a look:

After taking a glance at this sign, I couldn’t help but shake my head.

Not only did the sign have over 45 words, but the process to pay for parking was long and tedious. Even the owner of the parking lot knew it was overwhelming enough to write that the “simple instructions” would take only 1 minute.

I think we can all agree that cutting back on the amount of text on the sign would be a great idea, but I’m more concerned about the actual payment process for this parking lot. Not only does it require the customer to use their cell phones to send a text message, wait to receive a text message back, click on a link and then manually enter your credit card details on your smartphone, but there is actually a parking lot attendant there while you do all of this work.

Wait. I lied. There isn’t a single human being there who could make this process much easier by swiping your credit card or taking cash – there are TWO!

You can imagine how upsetting this could be to someone who is struggling to get through the “simple steps” as indicated on the sign. Luckily, I was travelling with friends who had United States cell phone plans because my Canadian cell phone roaming data charges would have made it cheaper for me to just get towed and pay the fee later.

So while this company has good intentions to use technology to make the payment process easier, they are experiencing the opposite result. Not only does this payment process limit revenue by restricting their customer base to only those with smartphones, but even smartphone users may possibly seek out a parking lot with easier payment options.

The parking lot experience reminded me a lot of what we often do in education when it comes to technology use. In Simon Sinek’s book, *Start With Why* and in summary during his TED Talk, *How Great Leaders Inspire Action*, he explains the importance of starting with * why* you are doing something rather than

I’m sharing this story as an example of how we can easily lose focus on why technology is so prevalent in the world today. We all see that technology is ever increasingly influencing how we live our lives each day including in education, however it is easy to forget why. When I encountered the long and tedious payment process for this particular parking lot, I immediately thought of how quickly I lost focus of why I had started integrating technology in my math class back in 2012. My initial goal was to use technology to more efficiently teach my math class and make the learning mathematics a richer experience for my students. However, there were many times when I would use technology and inevitably make the teaching and learning of mathematics more complex with little to no added benefit.

It was only after a number of years teaching with iPads in my math classroom that I came across research by Ruben Puntadura which he summarized as the **SAMR Model**. According to his research, he suggests that we can use technology in education to either **enhance** or **transform** learning.

Furthermore, he claims that enhancing a lesson consists of either **substituting** what you are currently doing with technology or using the technology to **augment** your lesson, while technology use that is transformative consists of significantly modifying or completely redefining your instruction.

Let’s look at the SAMR Model more closely.

When we use technology as a replacement for something we have always done previously, but have not gained any functional improvement, our technology use is considered to be a **substitution**. An example of this might include using iPads to read static handouts that would typically be given out in a workbook and are not accessible in any cloud based storage for access from other devices via the internet.

The most common stage I tend to find technology being used at in the classroom is the **augmentation stage**. In this stage, technology is being used to provide some functional improvement to how teaching and learning may have taken place without technology present. For example, using iPads or Chromebooks as a tool for students to create digital portfolios to share with their teachers and parents or a teacher re-creating content currently presented in black and white transparencies on an overhead projector to slides with full colour diagram and details. The teacher may also choose to share the content on the internet so students can access the information from anywhere on any device.

The use of technology in math class is considered to be **transformational** when the tools are used to redesign tasks significantly. To introduce the idea of systems of linear equations for example, the teacher could use their smartphone to record a video of different groups of items being weighed on a scale and have kids use their intuition to figure out the weight of one of the items and then share their thinking to the class using a tool like Knowledgehook Gameshow.

Another stage of transformational technology use in math class occurs when students are able to engage in tasks that were **previously inconceivable** without the use of the technology. For example, instead of the teacher giving definitions, rules and procedures to explain distance-time graphs, she could create a video of herself walking and ask students to sketch a prediction of what the graph might look like on their device using a tool like Desmos Activity Builder or PearDeck. Then, the students could use their device to record a partner walking and then challenge classmates to draw the matching graph.

While using technology can be fun and engaging for teachers and students, what we really need to be aware of is when the use of technology can actually impact student learning outcomes.

Although using technology as a substitute or to augment your lessons might improve the workflow of your math class, research suggests that you shouldn’t expect to see any significant improvements to student learning outcomes since the actual teaching and learning remains relatively unchanged.

However, when teachers find ways to transform their lessons with technology by significantly redesigning tasks or engaging in activities that were previously inconceivable without the technology tools, there is a potential (not a guarantee) to impact student learning outcomes.

Something important to note about the **SAMR Model** is that you are not stuck to any one stage for any given period of time. One teacher can use technology for one portion of the lesson as a substitute, while completely redefining how another portion of the lesson might have been delivered without technology. I believe the key for educators is to try to find opportunities to transform how they teach mathematics with technology when appropriate, while avoiding falling into the trap of forcing it in situations where we aren’t at least getting some functional improvement.

The parking lot owner from the beginning of this post has to make very similar decisions to those that we must make as educators when it comes to using technology. We may have good intentions when we attempt to use technology in our business or in our classrooms, but it is easy to lose track of ** why** we consider using a technology tool in the first place. If I can give any advice based on the lessons I’ve learned over the past five years teaching with 1:1 iPads in my math class, I’d suggest reminding yourself to reflect on the desired student learning outcomes you have set for the lesson/unit/course before you determine which tools – whether digital or not – give you the best chance to achieve those outcomes.

Only then will we be able to make appropriate decisions regarding which technology tools we should use in our classroom and when they are most beneficial to the students we serve.

Interested in reading more about the SAMR Model? Check out these blog posts:

Taking a Dip in the SAMR Swimming Pool – Carl Hooker

SAMR Swimming Lessons – Carl Hooker

SAMR Model Explained for Teachers – Educational Technology and Mobile Learning

Using SAMR to Teach Above The Line – Susan Oxnevad

Resources to Support the SAMR Model – Kathy Schrock’s Guide to Everything

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]]>Cheese and Crackers is a 3 act math task that introduces a situation that allows students to explore fractions as quotient and operator.

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]]>As I’ve mentioned before, working with **fractions** can be very difficult for both teachers to teach and students to understand. This reason could contribute to why so many math classrooms teach students fractions procedurally instead of building a conceptual understanding beforehand. My first attempt at tackling fractions in 3 acts was with the Gimme a Break task and I’ve since shared a Progression of Fractions post to help highlight some of the complexities and misconceptions.

In this task, we look at a situation we’ve all been in before. You cut yourself a few slices of cheese from the brick and grab a handful of crackers from the box. Let’s explore **fractions as quotient** and **fractions as operator** as we try to determine how we should split the cheese to ensure we have enough for our cheese and crackers craving.

Show the students this video.

I then have students take 30 seconds to discuss with their elbow partners what they notice and wonder before sharing out with the group.

After students share out with the class, I tell a story about the situation from the video and how annoying it is when you just randomly break off pieces of cheese for your crackers and then end up with too many crackers left with not enough cheese. DOH!

So, the question we begin with is:

How could the cheese be cut to split evenly with the crackers?

It’s pretty difficult to see how many crackers there are. I’d wait until somebody raises a stink about it. Then, I’ll show them this video.

The video shows me rearranging the crackers into a 3 by 4 array. (Did you know I love arrays?)

In a perfect world, you have cheese and crackers for students to work with when doing this activity. However, I understand if you were too busy to pick up the goods or if you’re living in Canada and it’s just too expensive to buy cheese! In either case, I like to have square tiles and relational rods (or Cuisenaire Rods) on the table for students to manipulate and experience before diving into any visual and/or symbolic mathematical work.

Walking around the room to help sequence how you plan to have students share their thinking is really important here.

After consolidating this task, I’ll then show them the 3rd act video.

Show students this image.

Give students time to work through this using manipulatives and/or any visual or symbolic representations they choose to use.

Then, show them the act 3, representation #1 video.

Another possible representation might be this one.

Show students this image.

Give students time to work through this using manipulatives and/or any visual or symbolic representations they choose to use.

Then, show them this video as a sample of a representation that leverages spatial reasoning.

There are a ton of interactive edtech tools out there that make it easy to take a 3 act math task like this one and transform it into something interactive. Whether you choose Knowledgehook Gameshow, Desmos Custom Activity Builder, Recap! or GoFormative, you have a ton of options to use based on what you intend to achieve. While I’d argue a 3 act math task is fine and dandy with a projector and whiteboards, I’ve taken this task and tossed it into PearDeck.

Access the PearDeck here and feel free to make a copy.

Hopefully you and your students enjoy this task as an entry point into exploring fractions as quotient and fractions as operator! I hope to provide some consolidation animations at some point, but I have yet to sit down and get them carved out. Let me know in the comments if this is something you might need/want for your practice.

Enjoy!

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]]>Get your fix of caffeine, probability and proportional reasoning with this 3 act math task involving Tim Horton's Roll Up The Rim to Win: Canada 150

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]]>As I was sipping on a hot Tim Horton’s Dark Roast coffee this morning during a meeting, I happened to notice a big “150” on my cup with that familiar yellow arrow we see when it is Roll Up The Rim to Win time here in Canada. Ironically, it was the second last day of the Canada 150 Math Challenge and I wasn’t set on what task I was going to share for the final day of the month long math initiative around Canada’s 150th Birthday. How could I not go with something related to roll up the rim?

Show your students this video.

Then, ask your students what they notice and what they wonder?

Discuss these noticings and wonderings with their neighbours, then share out as a class. I like jotting these down on chart paper or on the whiteboard.

Then, show them this image:

Ask them to add to their list of noticings and wonderings.

Some noticings and wonderings might include:

- there are 20 cups
- they look like they have been used or partially drank
- how many people were at the meeting?
- why are there different sizes?
- and many more…

However, the question I’m really excited about is:

How many winning rims are there?

Then ask them to make a prediction.

If you head to the Tim Horton’s Roll Up The Rim Canada 150 website, you’ll find all kinds of great details to run with.

On that site, you’ll find the Tim Hortons Roll Up The Rim to Win Canada 150 Contest Rules and Details which gives you 9 pages worth of details including:

I’m sure you can see that there are a bunch of extension problems that you might want to consider with this one as well.

Now, have students update their predictions.

Show students this video.

and/or this image:

Here’s another sample of cups from a second meeting a few days later. Man, we drink a lot of coffee and make a lot of garbage!

Act 1 Image:

Act 3 Image:

- Did this sample beat the odds or not. How do you know?
- Assume there was one Roll Up The Rim to Win cup for every Canadian and the odds stayed the same. How many Canadians should expect to win? How much money would that cost Tim Hortons?
- How many coffees do you expect you’ll need to buy before you win your first prize?

Let me know in the comments what you did with this task and how it turned out!

Click on the button below to grab all the media files for use in your own classroom:

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]]>Check out this task involving the Canada 150 Mosaic Project. What do you notice? Wonder? How many tiles are there in that massive mosaic?

The post Massive Mosaic appeared first on Tap Into Teen Minds.

]]>This task was inspired by Lynne Comartin; a friend from my former school, Tecumseh Vista Academy K-12. As you may know, I have been putting out a task a day for the #Canada150Math Challenge and luckily, as I was scrolling through my Facebook feed, I saw this beautiful image:

It had curiosity written all over it.

While there are a ton of great projects going on for Canada’s 150th Birthday such as the Great Canadian Flag in my hometown of Windsor, Ontario, I had not heard of the Canada 150 Mosaic Challenge. This mosaic was created by Tecumseh Vista Academy and members of the community in Tecumseh, Ontario for the challenge. You can learn more about how you and your community can get involved here.

So let’s get going!

Show students the image above or, the image below:

Then ask students to do a rapid write of what they notice and what they wonder.

Students will then share out their noticings and wonderings while I jot their ideas down on the whiteboard.

While we may explore some other wonderings, the first question I intend to address is:

How many tiles are there in this mosaic?

With manipulatives and/or paper/whiteboards already out on their tables, I would then give students some time to make a prediction and discuss with their neighbours and/or group.

After students have shared out their predictions, I would show them some information.

I’d recommend having base ten blocks on the table, however some students may choose another option such as an open array or area model using partial products to help them solve. The standard algorithm can also be useful, but I caution against promoting the use of the standard algorithm until students can represent the multiplication concretely and visually.

After allowing students to share their solutions based on the progressive sequence that you determined as you worked your way around the room, you may want to show this image to go along with some of the other representations that come up in the classroom.

I’m a big promoter of ensuring students see the interconnectedness that happens between strands of mathematics. In this problem, it is really easy to connect the problem to measurement and area when we ask students:

How much area does the mosaic cover?

You may consider having students make a prediction, or you can jump straight to act 2 and share these measurements:

Next, we ask students:

How Many Murals To Cover The Great Canadian Flag?

If you haven’t done The Great Canadian Flag task yet, I strongly encourage you do so. Lots of estimating and proportional reasoning in that task and it will really build the curiosity around this particular extension.

I hope you enjoy the task!

I’d love it if you’d leave some feedback and student work in the comments!

Click on the button below to grab all the media files for use in your own classroom:

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]]>Area of Saskatchewan is a 3 act math task created specifically for the #Canada150Math Challenge about Area of a Trapezoid.

The post Area of Saskatchewan appeared first on Tap Into Teen Minds.

]]>Here we are in week 3 of the #Canada150Math Challenge and after finally moving west to North Vancouver to mathematize the Canada 150 Mountie salute on the Capilano Suspension Bridge, I thought we should head to the prairies to see what sort of math fun we could have there.

This question was inspired by an old EQAO problem from the Winter 2007 Applied Assessment of Mathematics about the area of Saskatchewan:

Doesn’t quite generate that mathematical excitement I am typically looking for, but still a worthwhile problem. I’m thinking we could have a lot of fun with this and maybe even spark some curiosity at the same time.

Show students the act 1 video.

Then ask students to do a rapid write of what they notice and what they wonder. Alternatively, you might have students simply chat this out with their neighbours.

Hopefully students will generate some great noticings and wonderings. I’m hoping that we’ll be able to steer some of the inquiry around the area of Saskatchewan based on this additional video I would show:

Since we’re zoomed in on Saskatchewan with Wanuskewin Heritage Park highlighted, hopefully some noticings and wonderings about that location may arise.

While some questions like the following may arise:

What is the area of Saskatchewan?

or

What percentage of Canada does Saskatchewan represent?

I’m hoping to eventually get to some questions involving First Nation, Metis and Inuit (FNMI) peoples. With this being Canada’s 150th Birthday, I believe it is important that we acknowledge those who were here before us and recognize the very small area of Canadian soil that is reserved for these groups.

So while it might be useful to have students do some comparisons like what percentage of Canada’s land is considered to be Saskatchewan, I hope we can get to some questions regarding the FNMI peoples on the next day.

If you’re hoping to do some of those initial comparisons to relate the area of Saskatchewan to Canada, you might want to show these:

Some other questions you might consider on this day:

How many “Saskatchewans” would it take to cover all of Canada?

Which has a greater area? Your province or Saskatchewan?

Which has a greater population density? Your province or Saskatchewan?

No full visual solution created for this task (YET). However, I do have a Visualizing the Area of a Trapezoid video you might find useful:

Did you come up with some cool solutions in your class?

Reply in the comments and share out your work. I’d love to post it here!

Show students this image:

You can print out a map of Saskatchewan and have them shade in the portion they believe represents the area reserved for FMNI peoples. You might want to remind them of their area calculation from the last day for them to consider.

You might want to have students calculate the percentage as a comparison.

Then, you can have them do the same thing for Canada:

Hopefully students will realize that the amount of land dedicated for the people who were here before confederation is really small.

Why might that be?

You might have students do some research to determine approximately how many FNMI people are in Canada. What proportion of the Canadian population does this represent?

Is that percentage in line with the percentage of land dedicated for the FNMI peoples?

If not, what area of land should be reserved for FNMI people?

Can you think of more questions that students should be thinking about as we continue through our Month of Math this June during Canada’s 150th Birthday?

Be sure to check back to my blog, the GECDSB Canada150Math page and follow the @Canada150Math Twitter account and #Canada150Math hashtag to access a new math question or provocation each weekday throughout the month. We hope you’ll share photos of students engaging in Canada150Math tasks and their thinking so we can re-tweet with the rest of Canada!

Click on the button below to grab all the media files for use in your own classroom:

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]]>Giant Rubber Duck is one of many 3 act math tasks created specifically for the #Canada150Math Challenge! Have fun making predictions and learning math!

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]]>We are cruising through week 2 of the #Canada150Math Challenge and I was inspired by @NatashaMFolino to create the visuals for this task when she shared the following tweet on the #Canada150Math hashtag:

Ok @PiusSchool @SudburyCDSB @Canada150Math…what is your thinking…#mathsudburycatholic #facilitatorscdsb #canada150math pic.twitter.com/dc42tFtjMp

— Natasha Folino (@NatashaMFolino) June 2, 2017

For those who aren’t aware, the Giant Rubber Duck will be making a visit to Toronto and five other towns in Ontario for Canada’s 150th Birthday during the summer. There are some articles here, here and here that might inspire other questions for you to use in your classroom.

We will be continuing the challenge all month long, so be sure to check them all out here.

Show students the act 1 video.

Then ask students to do a rapid write of what they notice and what they wonder. Alternatively, you might have students simply chat this out with their neighbours.

Then, show this video outlining an image to scale comparing the Giant Rubber Duck and the CN Tower.

From the video, students are challenged to predict:

How many Giant Rubber Ducks tall is the CN Tower?

Then, I ask them to **make a prediction** based only on their spatial reasoning from the visual and intuition.

Once students have been given some time to think independently and then discuss with neighbours, we will share out to the group and jot down some predictions.

After students have stated predictions and their reasoning, I’ll show students some more information gradually.

Depending on the readiness of your group, you might consider showing this image which reveals the height of one duck and the height of the CN Tower:

Or, you might share this image showing the height of 4 ducks and the height of the CN Tower:

Once students have had time to work and share their thinking, we can show the act 3 video to see how many Mr. Pearces it will take to reach the height of The Great Canadian Flag.

Alternatively, you could show this image:

Show students this video.

Allow some time for students to notice and wonder.

The question I’m hoping to land on is:

How many ducks can fit in the Western Channel?

Allow students to talk with their peers and arrive at predictions. Share them out.

After students share and you record predictions, then give them some information to work with to update their predictions.

Show students this video.

Alternatively, you can show this image:

In this sequel, we set up the question for Day #7 of the #Canada150Math Challenge:

In this task, we are asking students to think about the Giant Rubber Duck in terms of weight:

How many people would it take to outweigh the giant rubber duck?

As usual, we’re looking for students to make predictions first.

You might want to give kids some context as to how tall the duck is in comparison to an adult (or in terms of a student).

After predictions are made, you can have students go ahead and actually attempt calculating how many people it would take using their own assumptions (are the people adults? students? etc.).

I hope you have some fun with this one and are going to share out to the hashtag on Twitter!

Fun stuff, eh?

Be sure to check back to my blog, the GECDSB Canada150Math page and follow the @Canada150Math Twitter account and #Canada150Math hashtag to access a new math question or provocation each weekday throughout the month. We hope you’ll share photos of students engaging in Canada150Math tasks and their thinking so we can re-tweet with the rest of Canada!

Click on the button below to grab all the media files for use in your own classroom:

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