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Squares 1 to 30 Mental Maths Worksheet

Mental maths lesson 18: Squares up to 30 · Set 105 · 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. 2.28² =
  3. 3.11² =
  4. 4.14² =
  5. 5.19² =
  6. 6.29² =
  7. 7.27² =
  8. 8.13² =
  9. 9.26² =
  10. 10.12² =
  11. 11.24² =
  12. 12.18² =
  13. 13.23² =
  14. 14.25² =
  15. 15.16² =
  16. 16.17² =
  17. 17.15² =
  18. 18.13² =
  19. 19.22² =
  20. 20.16² =
  21. 21.11² =
  22. 22.14² =
  23. 23.16² =
  24. 24.21² =
  25. 25.14² =
  26. 26.12² =
  27. 27.17² =
  28. 28.12² =
  29. 29.17² =
  30. 30.17² =
  31. 31.23² =
  32. 32.28² =
  33. 33.21² =
  34. 34.15² =
  35. 35.12² =
  36. 36.13² =
  37. 37.12² =
  38. 38.15² =
  39. 39.11² =
  40. 40.21² =

Answer key

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

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