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Squares 1 to 30 Mental Maths Worksheet

Mental maths lesson 18: Squares up to 30 · Set 909 · 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. 1.17² =
  2. 2.19² =
  3. 3.23² =
  4. 4.29² =
  5. 5.28² =
  6. 6.15² =
  7. 7.14² =
  8. 8.26² =
  9. 9.12² =
  10. 10.21² =
  11. 11.25² =
  12. 12.11² =
  13. 13.24² =
  14. 14.13² =
  15. 15.18² =
  16. 16.22² =
  17. 17.16² =
  18. 18.16² =
  19. 19.22² =
  20. 20.27² =
  21. 21.21² =
  22. 22.14² =
  23. 23.28² =
  24. 24.13² =
  25. 25.15² =
  26. 26.14² =
  27. 27.27² =
  28. 28.16² =
  29. 29.25² =
  30. 30.12² =
  31. 31.25² =
  32. 32.29² =
  33. 33.21² =
  34. 34.12² =
  35. 35.29² =
  36. 36.18² =
  37. 37.17² =
  38. 38.16² =
  39. 39.24² =
  40. 40.28² =

Answer key

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

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