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Find a missing side from the area

Grade 3 math · Fieldbook Learning

Name ______________________ Date __________

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

  1. A rectangular garden has an area of 20 square cm and is 4 cm long. How wide is it? Write the number only.
  2. A rectangular garden has an area of 10 square m and is 2 m long. How wide is it? Write the number only.
  3. A rectangular banner has an area of 12 square m and is 3 m long. How wide is it? Write the number only.
  4. A rectangular card has an area of 6 square cm and is 2 cm long. How wide is it? Write the number only.
  5. A rectangular poster has an area of 24 square m and is 6 m long. How wide is it? Write the number only.
  6. A rectangle has an area of 12 square m and is 6 m long. How wide is it? Write the number only.
  7. A rectangular poster has an area of 10 square cm and is 5 cm long. How wide is it? Write the number only.
  8. A rectangular garden has an area of 10 square m and is 5 m long. How wide is it? Write the number only.
  9. A rectangular garden has an area of 15 square cm and is 5 cm long. How wide is it? Write the number only.
  10. A rectangle has an area of 81 square m and is 9 m long. How wide is it? Write the number only.
  11. A rectangle has an area of 14 square cm and is 7 cm long. How wide is it? Write the number only.
  12. A rectangular mat has an area of 40 square m and is 8 m long. How wide is it? Write the number only.
  13. A rectangular tile has an area of 15 square m and is 5 m long. How wide is it? Write the number only.
  14. A rectangular garden has an area of 40 square cm and is 4 cm long. How wide is it? Write the number only.
  15. A rectangle has an area of 21 square cm and is 7 cm long. How wide is it? Write the number only.
  16. A rectangular tile has an area of 18 square m and is 3 m long. How wide is it? Write the number only.
  17. A rectangular garden has an area of 66 square cm and is 11 cm long. How wide is it? Write the number only.
  18. A rectangular poster has an area of 55 square m and is 11 m long. How wide is it? Write the number only.
  19. A rectangular rug has an area of 132 square cm and is 11 cm long. How wide is it? Write the number only.
  20. A rectangular mat has an area of 25 square m and is 5 m long. How wide is it? Write the number only.
More free practice: fieldbooklearning.com/practice/grade-3/find-a-missing-side-from-the-area/

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 area

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