Models & Strategies · Grades 3–4
Perimeter: Six Ways to Work With It
One rectangle, 12 + 7 + 12 + 7 = 38 units, worked six ways, with a smaller one worked beside it each time.
seen one of these on a test? See it on a real question: TEKS 3.7B, perimeter, and a missing side, or TEKS 4.5D, perimeter and area of rectangles.