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Grade 3 perimeter of rectangles worksheets

3.MD.D.8 Measurement and geometry

Printable perimeter of rectangles worksheets for grade 3, aligned to Common Core standard 3.MD.D.8. Add all four sides.

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Sample problems

  1. A rectangle is 2 m long and 13 m wide. What is its perimeter? 30 m
  2. A rectangle is 5 m long and 15 m wide. What is its perimeter? 40 m
  3. A rectangle is 8 m long and 16 m wide. What is its perimeter? 48 m
  4. A rectangle is 16 m long and 10 m wide. What is its perimeter? 52 m
  5. A rectangle is 2 m long and 11 m wide. What is its perimeter? 26 m
  6. A rectangle is 16 m long and 14 m wide. What is its perimeter? 60 m
  7. A rectangle is 4 m long and 12 m wide. What is its perimeter? 32 m
  8. A rectangle is 2 m long and 14 m wide. What is its perimeter? 32 m

These eight are one sample at medium difficulty — the generator makes a different set every time.

A worked example

A rectangle is 2 m long and 13 m wide. What is its perimeter? 30 m

  1. Perimeter is all four sides added: 2 + 13 + 2 + 13
  2. One long side and one short side: 2 + 13 = 15
  3. There are two of each, so 2 × 15 = 30 m

Every problem on the answer key can show its steps like this — turn on “Show steps” before downloading.

About these worksheets

Each problem states its own measurements, so the reasoning is the same but the arithmetic is new every time. Every sheet is generated fresh, so you can print a new one on the same skill as often as you need — different numbers, same difficulty.

Pick how many problems you want and whether they should be easy, medium or hard, then download a PDF with a matching answer key. The key can show the worked steps for every problem, which is what a parent needs to see where a wrong answer went wrong.

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