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Squares 1 to 30 Mental Maths Worksheet

Mental maths lesson 18: Squares up to 30 · Set 181 · 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. 2.19² =
  3. 3.18² =
  4. 4.26² =
  5. 5.15² =
  6. 6.17² =
  7. 7.29² =
  8. 8.13² =
  9. 9.14² =
  10. 10.25² =
  11. 11.12² =
  12. 12.28² =
  13. 13.22² =
  14. 14.23² =
  15. 15.24² =
  16. 16.16² =
  17. 17.21² =
  18. 18.14² =
  19. 19.11² =
  20. 20.14² =
  21. 21.22² =
  22. 22.18² =
  23. 23.25² =
  24. 24.29² =
  25. 25.28² =
  26. 26.28² =
  27. 27.22² =
  28. 28.25² =
  29. 29.26² =
  30. 30.28² =
  31. 31.16² =
  32. 32.13² =
  33. 33.18² =
  34. 34.15² =
  35. 35.16² =
  36. 36.16² =
  37. 37.28² =
  38. 38.14² =
  39. 39.22² =
  40. 40.24² =

Answer key

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

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