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Squares 1 to 30 Mental Maths Worksheet

Mental maths lesson 18: Squares up to 30 · Set 117 · 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. 2.15² =
  3. 3.11² =
  4. 4.25² =
  5. 5.17² =
  6. 6.13² =
  7. 7.23² =
  8. 8.19² =
  9. 9.28² =
  10. 10.16² =
  11. 11.14² =
  12. 12.29² =
  13. 13.22² =
  14. 14.12² =
  15. 15.24² =
  16. 16.27² =
  17. 17.18² =
  18. 18.11² =
  19. 19.28² =
  20. 20.23² =
  21. 21.25² =
  22. 22.26² =
  23. 23.14² =
  24. 24.16² =
  25. 25.25² =
  26. 26.14² =
  27. 27.11² =
  28. 28.13² =
  29. 29.13² =
  30. 30.15² =
  31. 31.29² =
  32. 32.21² =
  33. 33.15² =
  34. 34.22² =
  35. 35.26² =
  36. 36.26² =
  37. 37.29² =
  38. 38.21² =
  39. 39.28² =
  40. 40.18² =

Answer key

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

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