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Squares 1 to 30 Mental Maths Worksheet

Mental maths lesson 18: Squares up to 30 · Set 641 · 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. 2.26² =
  3. 3.21² =
  4. 4.19² =
  5. 5.12² =
  6. 6.11² =
  7. 7.13² =
  8. 8.14² =
  9. 9.24² =
  10. 10.16² =
  11. 11.29² =
  12. 12.15² =
  13. 13.23² =
  14. 14.25² =
  15. 15.18² =
  16. 16.28² =
  17. 17.17² =
  18. 18.22² =
  19. 19.15² =
  20. 20.21² =
  21. 21.15² =
  22. 22.19² =
  23. 23.15² =
  24. 24.19² =
  25. 25.29² =
  26. 26.18² =
  27. 27.14² =
  28. 28.26² =
  29. 29.23² =
  30. 30.14² =
  31. 31.14² =
  32. 32.25² =
  33. 33.22² =
  34. 34.27² =
  35. 35.19² =
  36. 36.14² =
  37. 37.13² =
  38. 38.23² =
  39. 39.17² =
  40. 40.28² =

Answer key

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

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