grade 3 · MG-021

Find rectangle perimeter

Add every outside side length without confusing perimeter with area.

Learn togetherFresh problem · seed 1161503896

A rectangle is 12 units long and 8 units wide. What is its perimeter?

Let's work it out together.

Work through one checkpoint at a time. Your answer area opens after the reasoning.

Checkpoint 1

Trace only the outside boundary, not the inside.
Checkpoint 2

The top and bottom are each 12 units; the left and right are each 8 units.
Checkpoint 3

Add 12 + 8 + 12 + 8.

Your answer