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Find the missing base of a triangle

Year 6 maths · Fieldbook Learning

Name ______________________ Date __________

Work backward from the area: base × height = twice the area.

  1. A triangle has an area of 20 cm² and a height of 4 cm. What is the length of its base?
  2. A triangle has an area of 8 cm² and a height of 4 cm. What is the length of its base?
  3. A triangle has an area of 25 cm² and a height of 5 cm. What is the length of its base?
  4. A triangle has an area of 4 cm² and a height of 2 cm. What is the length of its base?
  5. A triangle has an area of 22 cm² and a height of 11 cm. What is the length of its base?
  6. A triangle has an area of 12 cm² and a height of 12 cm. What is the length of its base?
  7. A triangle has an area of 40 cm² and a height of 10 cm. What is the length of its base?
  8. A triangle has an area of 11 cm² and a height of 11 cm. What is the length of its base?
  9. A triangle has an area of 63 cm² and a height of 7 cm. What is the length of its base?
  10. A triangle has an area of 78 cm² and a height of 13 cm. What is the length of its base?
  11. A triangle has an area of 160 cm² and a height of 20 cm. What is the length of its base?
  12. A triangle has an area of 171 cm² and a height of 19 cm. What is the length of its base?
  13. A triangle has an area of 104 m² and a height of 13 m. What is the length of its base?
  14. A triangle has an area of 72 m² and a height of 18 m. What is the length of its base?
  15. A triangle has an area of 238 m² and a height of 17 m. What is the length of its base?
  16. A triangle has an area of 231 m² and a height of 21 m. What is the length of its base?
  17. A triangle has an area of 3552 m² and a height of 74 m. What is the length of its base?
  18. A triangle has an area of 2405 m² and a height of 65 m. What is the length of its base?
  19. A triangle has an area of 1134 m² and a height of 81 m. What is the length of its base?
  20. A triangle has an area of 392 m² and a height of 14 m. What is the length of its base?
More free practice: fieldbooklearning.com/au/practice/year-6/find-the-base-of-a-triangle-from-its-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 the missing base of a triangle

  1. 10 cm
  2. 4 cm
  3. 10 cm
  4. 4 cm
  5. 4 cm
  6. 2 cm
  7. 8 cm
  8. 2 cm
  9. 18 cm
  10. 12 cm
  11. 16 cm
  12. 18 cm
  13. 16 m
  14. 8 m
  15. 28 m
  16. 22 m
  17. 96 m
  18. 74 m
  19. 28 m
  20. 56 m