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Squares 1 to 30 Mental Maths Worksheet

Mental maths lesson 18: Squares up to 30 · Set 687 · 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. 2.16² =
  3. 3.23² =
  4. 4.28² =
  5. 5.14² =
  6. 6.11² =
  7. 7.21² =
  8. 8.15² =
  9. 9.13² =
  10. 10.26² =
  11. 11.29² =
  12. 12.25² =
  13. 13.17² =
  14. 14.27² =
  15. 15.22² =
  16. 16.19² =
  17. 17.18² =
  18. 18.16² =
  19. 19.19² =
  20. 20.24² =
  21. 21.21² =
  22. 22.11² =
  23. 23.24² =
  24. 24.11² =
  25. 25.19² =
  26. 26.14² =
  27. 27.15² =
  28. 28.18² =
  29. 29.22² =
  30. 30.22² =
  31. 31.27² =
  32. 32.28² =
  33. 33.21² =
  34. 34.24² =
  35. 35.25² =
  36. 36.28² =
  37. 37.26² =
  38. 38.15² =
  39. 39.29² =
  40. 40.28² =

Answer key

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

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