Perimeter & Area of Composite figures - grade 7. Teaching idea: give students a "new home" and have them landscape the backyard by choosing a tree, a garden, and a pool. They then have to find the perimeter and area of each one, cut and paste to a green colored paper, and then find the area of grass needed to buy to finish off the yard by subtracting the areas of the items they put in. Kids love options! I also created another sheet with simpler numbers to differentiate.