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Squares 1 to 30 Mental Maths Worksheet

Mental maths lesson 18: Squares up to 30 · Set 921 · 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. 3.27² =
  4. 4.22² =
  5. 5.28² =
  6. 6.16² =
  7. 7.24² =
  8. 8.26² =
  9. 9.23² =
  10. 10.14² =
  11. 11.13² =
  12. 12.11² =
  13. 13.12² =
  14. 14.25² =
  15. 15.17² =
  16. 16.18² =
  17. 17.29² =
  18. 18.28² =
  19. 19.28² =
  20. 20.24² =
  21. 21.14² =
  22. 22.19² =
  23. 23.15² =
  24. 24.19² =
  25. 25.12² =
  26. 26.15² =
  27. 27.16² =
  28. 28.11² =
  29. 29.23² =
  30. 30.19² =
  31. 31.16² =
  32. 32.23² =
  33. 33.13² =
  34. 34.15² =
  35. 35.11² =
  36. 36.17² =
  37. 37.25² =
  38. 38.21² =
  39. 39.18² =
  40. 40.22² =

Answer key

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

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