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Squares 1 to 30 Mental Maths Worksheet

Mental maths lesson 18: Squares up to 30 · Set 469 · 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. 1.22² =
  2. 2.18² =
  3. 3.24² =
  4. 4.27² =
  5. 5.14² =
  6. 6.23² =
  7. 7.25² =
  8. 8.15² =
  9. 9.26² =
  10. 10.12² =
  11. 11.19² =
  12. 12.21² =
  13. 13.13² =
  14. 14.11² =
  15. 15.29² =
  16. 16.17² =
  17. 17.28² =
  18. 18.16² =
  19. 19.18² =
  20. 20.25² =
  21. 21.23² =
  22. 22.21² =
  23. 23.14² =
  24. 24.15² =
  25. 25.11² =
  26. 26.17² =
  27. 27.12² =
  28. 28.18² =
  29. 29.23² =
  30. 30.13² =
  31. 31.13² =
  32. 32.12² =
  33. 33.18² =
  34. 34.28² =
  35. 35.28² =
  36. 36.26² =
  37. 37.24² =
  38. 38.12² =
  39. 39.14² =
  40. 40.27² =

Answer key

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

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