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Squares 1 to 30 Mental Maths Worksheet

Mental maths lesson 18: Squares up to 30 · Set 621 · 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. 2.11² =
  3. 3.19² =
  4. 4.14² =
  5. 5.23² =
  6. 6.26² =
  7. 7.29² =
  8. 8.25² =
  9. 9.18² =
  10. 10.28² =
  11. 11.15² =
  12. 12.16² =
  13. 13.22² =
  14. 14.27² =
  15. 15.12² =
  16. 16.13² =
  17. 17.24² =
  18. 18.17² =
  19. 19.12² =
  20. 20.16² =
  21. 21.27² =
  22. 22.29² =
  23. 23.19² =
  24. 24.13² =
  25. 25.18² =
  26. 26.26² =
  27. 27.12² =
  28. 28.28² =
  29. 29.25² =
  30. 30.29² =
  31. 31.28² =
  32. 32.24² =
  33. 33.13² =
  34. 34.27² =
  35. 35.11² =
  36. 36.12² =
  37. 37.12² =
  38. 38.24² =
  39. 39.28² =
  40. 40.13² =

Answer key

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

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