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Squares 1 to 30 Mental Maths Worksheet

Mental maths lesson 18: Squares up to 30 · Set 765 · 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. 2.15² =
  3. 3.29² =
  4. 4.16² =
  5. 5.25² =
  6. 6.27² =
  7. 7.26² =
  8. 8.23² =
  9. 9.19² =
  10. 10.17² =
  11. 11.22² =
  12. 12.28² =
  13. 13.11² =
  14. 14.13² =
  15. 15.14² =
  16. 16.24² =
  17. 17.18² =
  18. 18.16² =
  19. 19.21² =
  20. 20.15² =
  21. 21.17² =
  22. 22.12² =
  23. 23.17² =
  24. 24.15² =
  25. 25.23² =
  26. 26.21² =
  27. 27.23² =
  28. 28.24² =
  29. 29.23² =
  30. 30.29² =
  31. 31.28² =
  32. 32.22² =
  33. 33.12² =
  34. 34.28² =
  35. 35.12² =
  36. 36.18² =
  37. 37.12² =
  38. 38.21² =
  39. 39.15² =
  40. 40.19² =

Answer key

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

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