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Find a missing side from the perimetre

Year 3 maths · Fieldbook Learning

Name ______________________ Date __________

Use the perimetre and the side you know to find the other side. Write the number only.

  1. A rectangular tile has a perimetre of 18 m and is 7 m long. How wide is it? Write the number only.
  2. A rectangular poster has a perimetre of 28 m and is 7 m long. How wide is it? Write the number only.
  3. A rectangular rug has a perimetre of 12 cm and is 3 cm long. How wide is it? Write the number only.
  4. A rectangular banner has a perimetre of 24 m and is 5 m long. How wide is it? Write the number only.
  5. A rectangular mat has a perimetre of 18 m and is 4 m long. How wide is it? Write the number only.
  6. A rectangle has a perimetre of 16 cm and is 6 cm long. How wide is it? Write the number only.
  7. A rectangular banner has a perimetre of 34 m and is 8 m long. How wide is it? Write the number only.
  8. A rectangular card has a perimetre of 16 cm and is 2 cm long. How wide is it? Write the number only.
  9. A rectangular garden has a perimetre of 22 cm and is 7 cm long. How wide is it? Write the number only.
  10. A rectangular tile has a perimetre of 36 cm and is 6 cm long. How wide is it? Write the number only.
  11. A rectangular banner has a perimetre of 32 cm and is 7 cm long. How wide is it? Write the number only.
  12. A rectangular tile has a perimetre of 36 m and is 6 m long. How wide is it? Write the number only.
  13. A rectangular poster has a perimetre of 34 m and is 12 m long. How wide is it? Write the number only.
  14. A rectangular rug has a perimetre of 60 m and is 15 m long. How wide is it? Write the number only.
  15. A rectangle has a perimetre of 54 cm and is 13 cm long. How wide is it? Write the number only.
  16. A rectangular card has a perimetre of 40 cm and is 9 cm long. How wide is it? Write the number only.
  17. A rectangular card has a perimetre of 38 m and is 6 m long. How wide is it? Write the number only.
  18. A rectangular garden has a perimetre of 52 cm and is 9 cm long. How wide is it? Write the number only.
  19. A rectangular card has a perimetre of 68 cm and is 16 cm long. How wide is it? Write the number only.
  20. A rectangular poster has a perimetre of 52 m and is 14 m long. How wide is it? Write the number only.
More free practice: fieldbooklearning.com/au/practice/year-3/find-a-missing-side-from-the-perimeter/

Play it as a quiz game

20 of these questions as multiple choice, with near-miss wrong answers, ready for Kahoot or Blooket.

  1. Download the game's own question template: in Kahoot, Add question → Import spreadsheet; in Blooket, Create a set → Spreadsheet import.
  2. Click the matching button below, then click the first empty question row of the template and paste.
  3. Save the template (Kahoot needs .xlsx, Blooket .csv) and upload it.
Download CSV

Answer key: Find a missing side from the perimetre

  1. 2
  2. 7
  3. 3
  4. 7
  5. 5
  6. 2
  7. 9
  8. 6
  9. 4
  10. 12
  11. 9
  12. 12
  13. 5
  14. 15
  15. 14
  16. 11
  17. 13
  18. 17
  19. 18
  20. 12