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Squares 1 to 30 Mental Maths Worksheet

Mental maths lesson 18: Squares up to 30 · Set 40 · 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. 1.12² =
  2. 2.21² =
  3. 3.16² =
  4. 4.25² =
  5. 5.27² =
  6. 6.14² =
  7. 7.11² =
  8. 8.13² =
  9. 9.15² =
  10. 10.19² =
  11. 11.17² =
  12. 12.23² =
  13. 13.29² =
  14. 14.28² =
  15. 15.22² =
  16. 16.17² =
  17. 17.18² =
  18. 18.24² =
  19. 19.26² =
  20. 20.12² =
  21. 21.15² =
  22. 22.12² =
  23. 23.17² =
  24. 24.17² =
  25. 25.16² =
  26. 26.17² =
  27. 27.24² =
  28. 28.17² =
  29. 29.18² =
  30. 30.18² =
  31. 31.25² =
  32. 32.23² =
  33. 33.28² =
  34. 34.22² =
  35. 35.26² =
  36. 36.16² =
  37. 37.16² =
  38. 38.18² =
  39. 39.19² =
  40. 40.13² =

Answer key

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

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