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Squares 1 to 30 Mental Maths Worksheet

Mental maths lesson 18: Squares up to 30 · Set 56 · 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. 1.15² =
  2. 2.23² =
  3. 3.28² =
  4. 4.14² =
  5. 5.16² =
  6. 6.29² =
  7. 7.17² =
  8. 8.18² =
  9. 9.24² =
  10. 10.25² =
  11. 11.27² =
  12. 12.22² =
  13. 13.21² =
  14. 14.26² =
  15. 15.29² =
  16. 16.13² =
  17. 17.11² =
  18. 18.12² =
  19. 19.25² =
  20. 20.19² =
  21. 21.14² =
  22. 22.23² =
  23. 23.15² =
  24. 24.25² =
  25. 25.15² =
  26. 26.27² =
  27. 27.26² =
  28. 28.17² =
  29. 29.14² =
  30. 30.18² =
  31. 31.18² =
  32. 32.27² =
  33. 33.21² =
  34. 34.15² =
  35. 35.27² =
  36. 36.28² =
  37. 37.14² =
  38. 38.13² =
  39. 39.18² =
  40. 40.19² =

Answer key

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

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