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Squares 1 to 30 Mental Maths Worksheet

Mental maths lesson 18: Squares up to 30 · Set 728 · 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. 1.23² =
  2. 2.27² =
  3. 3.17² =
  4. 4.29² =
  5. 5.25² =
  6. 6.13² =
  7. 7.11² =
  8. 8.21² =
  9. 9.28² =
  10. 10.26² =
  11. 11.12² =
  12. 12.15² =
  13. 13.22² =
  14. 14.18² =
  15. 15.24² =
  16. 16.16² =
  17. 17.13² =
  18. 18.14² =
  19. 19.17² =
  20. 20.19² =
  21. 21.23² =
  22. 22.21² =
  23. 23.19² =
  24. 24.24² =
  25. 25.28² =
  26. 26.26² =
  27. 27.27² =
  28. 28.21² =
  29. 29.28² =
  30. 30.23² =
  31. 31.21² =
  32. 32.14² =
  33. 33.25² =
  34. 34.29² =
  35. 35.29² =
  36. 36.18² =
  37. 37.17² =
  38. 38.26² =
  39. 39.28² =
  40. 40.19² =

Answer key

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

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