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Squares 1 to 30 Mental Maths Worksheet

Mental maths lesson 18: Squares up to 30 · Set 625 · 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. 1.21² =
  2. 2.15² =
  3. 3.11² =
  4. 4.23² =
  5. 5.13² =
  6. 6.18² =
  7. 7.16² =
  8. 8.14² =
  9. 9.12² =
  10. 10.26² =
  11. 11.22² =
  12. 12.24² =
  13. 13.19² =
  14. 14.21² =
  15. 15.25² =
  16. 16.29² =
  17. 17.27² =
  18. 18.22² =
  19. 19.28² =
  20. 20.17² =
  21. 21.28² =
  22. 22.11² =
  23. 23.15² =
  24. 24.27² =
  25. 25.27² =
  26. 26.26² =
  27. 27.21² =
  28. 28.14² =
  29. 29.21² =
  30. 30.26² =
  31. 31.28² =
  32. 32.28² =
  33. 33.28² =
  34. 34.19² =
  35. 35.19² =
  36. 36.17² =
  37. 37.14² =
  38. 38.27² =
  39. 39.27² =
  40. 40.17² =

Answer key

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

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