## R2D2 Post-Its by @MrOrr_geek

Applying Area to Proportional Reasoning Thus far in the spiral, I haven't made it to measurement yet. Today, we're going to touch on area and lead us into an exploration of area formulas over the next day or so. Jon Orr's R2D2 Post-It Notes 3 Act Math Challenge is a nice low floor task that works with area of a rectangle and proportional reasoning. Here's the Act 1 video we show the students: http://youtu.be/IbAhJ8T98UE Can't see the video? Click here. Here's the question we eventually settle on: Determine how many post-it notes it will take to cover the board? My students came up with some predictions including: Alex - 888 Jaden - 700 Olivia - 688 Cole - 756 Grace - 900 Lowwwwza - 950 S...

## Mowing the Lawn

Real World Mathematics Using Proportional Reasoning, Linear Equations & Measurement In the Mowing the Lawn task, students will have an opportunity to utilize skills related to proportional reasoning, linear equations, and measurement after watching the information Mr. Pearce collected while mowing his lawn. This activity is geared for his grade 9 applied class, however it can be modified to suit many other levels.   Math Topics Related To This Activity: Proportional reasoning Linear equations Finding the area of composite figures.   Act 1: Introducing the Task http://youtu.be/QHkFBtL0-0E   Some images to assist: Problem To Be Solved: How long will it take Mr. Pearce to mow ...

## Visualizing the Area of a Trapezoid Formula

Visually Understanding Area of a Trapezoid in Multiple Ways While some students are aware that they could find the area of a trapezoid by treating the shape like a composite figure, I wanted to help students better understand where the formula comes from with a visual aid. Here is the next video animation I created in my Visualizing Mathematics series: Visualizing the Area of a Trapezoid Formula. http://youtu.be/YgEIoCMfWrg Stage By Stage PDF File Here is a stage-by-stage PDF file for you to grab, if you'd like: [slideshare id=39606703&doc=visualizingtheareaofatrapezoidformula-animationslidedeck-140927194007-phpapp01] Please let me know if you/your students found this resource helpful to better understand where the V...