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Squares 1 to 30 Mental Maths Worksheet

Mental maths lesson 18: Squares up to 30 · Set 947 · 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. 2.14² =
  3. 3.17² =
  4. 4.27² =
  5. 5.13² =
  6. 6.22² =
  7. 7.24² =
  8. 8.28² =
  9. 9.12² =
  10. 10.23² =
  11. 11.18² =
  12. 12.16² =
  13. 13.26² =
  14. 14.29² =
  15. 15.19² =
  16. 16.25² =
  17. 17.11² =
  18. 18.15² =
  19. 19.15² =
  20. 20.12² =
  21. 21.17² =
  22. 22.13² =
  23. 23.19² =
  24. 24.15² =
  25. 25.24² =
  26. 26.13² =
  27. 27.28² =
  28. 28.21² =
  29. 29.21² =
  30. 30.15² =
  31. 31.29² =
  32. 32.24² =
  33. 33.29² =
  34. 34.13² =
  35. 35.18² =
  36. 36.14² =
  37. 37.12² =
  38. 38.25² =
  39. 39.21² =
  40. 40.27² =

Answer key

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

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