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Squares 1 to 30 Mental Maths Worksheet

Mental maths lesson 18: Squares up to 30 · Set 589 · 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. 2.27² =
  3. 3.28² =
  4. 4.12² =
  5. 5.14² =
  6. 6.24² =
  7. 7.18² =
  8. 8.17² =
  9. 9.16² =
  10. 10.29² =
  11. 11.26² =
  12. 12.23² =
  13. 13.13² =
  14. 14.19² =
  15. 15.25² =
  16. 16.11² =
  17. 17.22² =
  18. 18.15² =
  19. 19.28² =
  20. 20.13² =
  21. 21.14² =
  22. 22.27² =
  23. 23.12² =
  24. 24.29² =
  25. 25.12² =
  26. 26.26² =
  27. 27.22² =
  28. 28.29² =
  29. 29.16² =
  30. 30.28² =
  31. 31.16² =
  32. 32.12² =
  33. 33.21² =
  34. 34.24² =
  35. 35.27² =
  36. 36.15² =
  37. 37.19² =
  38. 38.26² =
  39. 39.26² =
  40. 40.21² =

Answer key

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

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