Perimeter
Ages 7–11Difficulty adapts to you
Perimeter
Perimeter is the total distance around the outside of a shape. Add up all the side lengths to find it.
Your goals
- ✓You can measure the distance around a shape.
- ✓You can use perimeter, side length correctly.
- ✓You can include every outside side exactly once.
Words to know
- perimeter:
- The total distance around the boundary of a 2D shape.
- side length:
- The distance from one vertex to the next.
Examples
- 1Rectangle 5 cm by 3 cm: P = 5 + 3 + 5 + 3 = 16 cm
- 2Square with side 4 cm: P = 4 × 4 = 16 cm
Check these
- • Do not multiply length by width, which finds area instead.
- • Keep every number, symbol, label, and unit in its correct place.
- • Show enough working to check how you reached your answer.
Helpful habits
- • Read the whole question before choosing what to do.
- • Show one clear step at a time and check each step.
- • If you are stuck, draw a model, try smaller numbers, or revisit the example.
Now try your own
Create your own perimeter example, solve it, and explain how you checked it.
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