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Squares 1 to 30 Mental Maths Worksheet

Mental maths lesson 18: Squares up to 30 · Set 435 · 40 questions
TalentJR

How to do it in your head ((a + b)²): Split: 27 = 20 + 7. Find 20² = 400, 2 × 20 × 7 = 280 and 7² = 49. Add, biggest first: 400 + 280 + 49.

NameDateTime takenScore ___ / 40
  1. 1.21² =
  2. 2.27² =
  3. 3.17² =
  4. 4.13² =
  5. 5.18² =
  6. 6.25² =
  7. 7.23² =
  8. 8.22² =
  9. 9.29² =
  10. 10.14² =
  11. 11.15² =
  12. 12.12² =
  13. 13.11² =
  14. 14.28² =
  15. 15.26² =
  16. 16.19² =
  17. 17.16² =
  18. 18.11² =
  19. 19.27² =
  20. 20.15² =
  21. 21.13² =
  22. 22.18² =
  23. 23.24² =
  24. 24.12² =
  25. 25.17² =
  26. 26.26² =
  27. 27.12² =
  28. 28.16² =
  29. 29.14² =
  30. 30.22² =
  31. 31.24² =
  32. 32.29² =
  33. 33.29² =
  34. 34.12² =
  35. 35.15² =
  36. 36.26² =
  37. 37.22² =
  38. 38.28² =
  39. 39.14² =
  40. 40.11² =

Answer key

  1. 441
  2. 729
  3. 289
  4. 169
  5. 324
  6. 625
  7. 529
  8. 484
  9. 841
  10. 196
  11. 225
  12. 144
  13. 121
  14. 784
  15. 676
  16. 361
  17. 256
  18. 121
  19. 729
  20. 225
  21. 169
  22. 324
  23. 576
  24. 144
  25. 289
  26. 676
  27. 144
  28. 256
  29. 196
  30. 484
  31. 576
  32. 841
  33. 841
  34. 144
  35. 225
  36. 676
  37. 484
  38. 784
  39. 196
  40. 121

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