by C. Elkins
I have heard from a few 4th grade teachers that a new standard is difficult for their students to grasp. It is 4.GM.2.2: Find the area of polygons that can be decomposed into rectangles.
I have a couple of suggestions which help students with a concrete-pictorial-abstract progression approach to this problem (which is more developmentally appropriate).
- I have attached an activity which involves the use of 1” color tiles to partition off irregular shapes and then determine the area of each smaller rectangle. It’s free and in 2 parts:
- I located an excellent reference which shows pictorially how to do this step-by-step. It also includes good information about perimeter. It is: Area and Perimeter
Some troubleshooting tips: Continue reading