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Squares 1 to 30 Mental Maths Worksheet

Mental maths lesson 18: Squares up to 30 · Set 389 · 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. 1.29² =
  2. 2.13² =
  3. 3.27² =
  4. 4.12² =
  5. 5.16² =
  6. 6.18² =
  7. 7.28² =
  8. 8.25² =
  9. 9.15² =
  10. 10.24² =
  11. 11.11² =
  12. 12.14² =
  13. 13.19² =
  14. 14.21² =
  15. 15.17² =
  16. 16.26² =
  17. 17.22² =
  18. 18.13² =
  19. 19.26² =
  20. 20.26² =
  21. 21.19² =
  22. 22.23² =
  23. 23.15² =
  24. 24.12² =
  25. 25.18² =
  26. 26.17² =
  27. 27.25² =
  28. 28.25² =
  29. 29.26² =
  30. 30.12² =
  31. 31.22² =
  32. 32.29² =
  33. 33.11² =
  34. 34.11² =
  35. 35.17² =
  36. 36.28² =
  37. 37.28² =
  38. 38.28² =
  39. 39.28² =
  40. 40.19² =

Answer key

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

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