Perimeter worksheets
Finding the perimeter, the distance around a shape, by adding the lengths of all its sides.
Download the free perimeter worksheet (PDF)
Perimeter worksheet
What’s on the worksheet
- 50 questions on perimeter, sized for US Letter paper
- 4 pages of questions plus an answer key on the last page
- Written for grade 3, matching Common Core 3.MD.D.8
- Name and date lines at the top, and room to show the work
Sample questions from this worksheet
- A square has sides of 11 cm. Find its perimeter.
- A square has sides of 12 cm. Find its perimeter.
- A square has sides of 5 cm. Find its perimeter.
- A rectangle is 11 cm long and 9 cm wide. Find its perimeter.
- A rectangle is 9 cm long and 7 cm wide. Find its perimeter.
- A rectangle is 5 cm long and 3 cm wide. Find its perimeter.
Preview the worksheet and answer key
Make a new perimeter worksheet
Need another page for extra practice, a retake or a second group in class? The free Mathify Kids test maker builds a fresh perimeter worksheet with different numbers every time. Choose Core, Standard or Challenge level, print it with its own answer key, or let your child take it on screen and see the score straight away.
Perimeter: a worked example (A rectangle 8 cm long and 5 cm wide)
- A rectangle has two lengths and two widths.
- Add all four sides: 8 + 5 + 8 + 5.
- The perimeter is 26 cm.
How to use it at home and in class
At home
Walk the edge of a rug or table and count steps. That is perimeter. Ten problems a day works better than a whole sheet at once. Mark them together with the answer key, then ask your child to explain one they got wrong: finding the mistake themselves is where the learning happens.
In class
Use the first row as a warm-up, a full page for independent practice, or five questions as an exit ticket. For a retake or a second group, make a new version with the test maker so every child gets different numbers.
Mistakes to watch for
- Adding only the two sides that are labeled.
- Mixing up perimeter and area.
What to practice before and after perimeter
- Before: types of angles. If this sheet is a struggle, go back a step.
- After: area of rectangles, once this one is mostly right.
- Learn it first: the perimeter lesson and the perimeter and area chart.
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Questions parents ask
What is the difference between perimeter and area?
Perimeter is the distance around the outside, measured in units like cm. Area is the space inside, measured in square units like cm².
What grade is this perimeter worksheet for?
It is written for grade 3 and matches Common Core standard 3.MD.D.8.
Can I get a different version of this perimeter worksheet?
Yes. Use the free Mathify Kids test maker to make a new perimeter worksheet with different numbers every time, at Core, Standard or Challenge level, with its own answer key.