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Squares 1 to 30 Mental Maths Worksheet

Mental maths lesson 18: Squares up to 30 · Set 66 · 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. 2.25² =
  3. 3.21² =
  4. 4.16² =
  5. 5.26² =
  6. 6.19² =
  7. 7.15² =
  8. 8.11² =
  9. 9.28² =
  10. 10.17² =
  11. 11.22² =
  12. 12.12² =
  13. 13.29² =
  14. 14.14² =
  15. 15.23² =
  16. 16.13² =
  17. 17.21² =
  18. 18.24² =
  19. 19.18² =
  20. 20.16² =
  21. 21.15² =
  22. 22.13² =
  23. 23.11² =
  24. 24.25² =
  25. 25.21² =
  26. 26.15² =
  27. 27.11² =
  28. 28.16² =
  29. 29.29² =
  30. 30.12² =
  31. 31.22² =
  32. 32.21² =
  33. 33.14² =
  34. 34.22² =
  35. 35.14² =
  36. 36.21² =
  37. 37.15² =
  38. 38.26² =
  39. 39.27² =
  40. 40.19² =

Answer key

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

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