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Squares 1 to 30 Mental Maths Worksheet

Mental maths lesson 18: Squares up to 30 · Set 381 · 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. 1.28² =
  2. 2.27² =
  3. 3.15² =
  4. 4.23² =
  5. 5.18² =
  6. 6.24² =
  7. 7.13² =
  8. 8.11² =
  9. 9.26² =
  10. 10.21² =
  11. 11.29² =
  12. 12.12² =
  13. 13.16² =
  14. 14.14² =
  15. 15.22² =
  16. 16.19² =
  17. 17.25² =
  18. 18.17² =
  19. 19.15² =
  20. 20.23² =
  21. 21.25² =
  22. 22.13² =
  23. 23.24² =
  24. 24.12² =
  25. 25.11² =
  26. 26.22² =
  27. 27.16² =
  28. 28.12² =
  29. 29.22² =
  30. 30.12² =
  31. 31.24² =
  32. 32.19² =
  33. 33.16² =
  34. 34.28² =
  35. 35.12² =
  36. 36.15² =
  37. 37.27² =
  38. 38.15² =
  39. 39.21² =
  40. 40.17² =

Answer key

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

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