Texas Math Models

Try “number line” or “4.5D”

Add up all the sides

12 + 7 + 12 + 7 = 38 units G3

start at one side and add them in order67671271276 + 7 + 6 + 7 = 2612 + 7 + 12 + 7 = 38the dot is where you started; you are done when every side is added

How this one works

How

start at a corner and add each side, back to where you began.

Best when

you are learning what perimeter means.

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