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Squares 1 to 30 Mental Maths Worksheet

Mental maths lesson 18: Squares up to 30 · Set 82 · 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. 1.27² =
  2. 2.21² =
  3. 3.15² =
  4. 4.14² =
  5. 5.16² =
  6. 6.26² =
  7. 7.22² =
  8. 8.25² =
  9. 9.28² =
  10. 10.12² =
  11. 11.13² =
  12. 12.19² =
  13. 13.18² =
  14. 14.23² =
  15. 15.29² =
  16. 16.17² =
  17. 17.24² =
  18. 18.11² =
  19. 19.19² =
  20. 20.21² =
  21. 21.14² =
  22. 22.25² =
  23. 23.19² =
  24. 24.22² =
  25. 25.21² =
  26. 26.15² =
  27. 27.13² =
  28. 28.12² =
  29. 29.25² =
  30. 30.14² =
  31. 31.22² =
  32. 32.13² =
  33. 33.13² =
  34. 34.21² =
  35. 35.11² =
  36. 36.21² =
  37. 37.11² =
  38. 38.26² =
  39. 39.14² =
  40. 40.15² =

Answer key

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

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