These task cards are an introduction to the objective above. They do not involve problem solving, although each figure is missing two side lengths, so reasoning is required. Although I believe everything should be taught in context, many of my students were struggling with the idea of finding the area and perimeter of rectilinear figures. I created these task cards as an introduction. Cards A - F can be decomposed into 2 rectangles. Cards G - L can be decomposed into 3 rectangles. Cards M and N are more challenging.
There are organizers included for 2 different ways to assess student understanding. One option includes individual answer cards for students to self-assess and rate their level of understanding. The second option provides a place for the teacher to initial after each task, and all answers are in one document to make this easy to assess.
As an option, the shapes with letters are included with 6 per page. Students need to label dimensions, but this gives students an opportunity to write directly on the shapes. These can be used for journals or small groups. They are grouped by level.
For students who are struggling, I also created each task card in a full-scale picture. Students can use color tiles (which are one square inch) to help them understand the concept. There are also suggestions for teaching perimeter. I included some notes and pictures.
There are two other sets for this unit that might interest you. I hope you will look at the previews!
I have task cards available for area and perimeter of rectangles:
If you would like problem solving tasks for both rectangles and rectilinear figures, I created a set of task cards for that, too:
I hope this is helpful! I welcome your comments and suggestions!
Recognize area as additive. Find areas of rectilinear figures by decomposing them into non-overlapping rectangles and adding the areas of the non-overlapping parts, applying this technique to solve real world problems.
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