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Squares 1 to 30 Mental Maths Worksheet

Mental maths lesson 18: Squares up to 30 · Set 431 · 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. 2.23² =
  3. 3.19² =
  4. 4.28² =
  5. 5.27² =
  6. 6.17² =
  7. 7.11² =
  8. 8.12² =
  9. 9.25² =
  10. 10.15² =
  11. 11.18² =
  12. 12.16² =
  13. 13.24² =
  14. 14.11² =
  15. 15.27² =
  16. 16.22² =
  17. 17.26² =
  18. 18.14² =
  19. 19.13² =
  20. 20.29² =
  21. 21.17² =
  22. 22.28² =
  23. 23.13² =
  24. 24.16² =
  25. 25.14² =
  26. 26.13² =
  27. 27.19² =
  28. 28.16² =
  29. 29.27² =
  30. 30.12² =
  31. 31.17² =
  32. 32.23² =
  33. 33.21² =
  34. 34.14² =
  35. 35.29² =
  36. 36.19² =
  37. 37.12² =
  38. 38.26² =
  39. 39.14² =
  40. 40.21² =

Answer key

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

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