Texas Math Models

Try “number line” or “4.5D”

When every side is the same

12 + 7 + 12 + 7 = 38 units G3–4

all sides equal? multiply one side, or divide the perimeterP = ?64 equal sides6 × 4= 24 units aroundP = 486 equal sides48 ÷ 6= 8 each sidenot only rectangles: any shape with equal sides works both ways

How this one works

How

multiply equal sides to find perimeter OR divide the perimeter by the number of sides to find the length of each side.

Best when

a square, or any shape with equal sides.

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.

The same problem, other ways