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Squares 1 to 30 Mental Maths Worksheet

Mental maths lesson 18: Squares up to 30 · Set 659 · 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. 1.29² =
  2. 2.17² =
  3. 3.27² =
  4. 4.28² =
  5. 5.14² =
  6. 6.25² =
  7. 7.13² =
  8. 8.18² =
  9. 9.16² =
  10. 10.12² =
  11. 11.11² =
  12. 12.21² =
  13. 13.19² =
  14. 14.26² =
  15. 15.23² =
  16. 16.24² =
  17. 17.22² =
  18. 18.15² =
  19. 19.23² =
  20. 20.29² =
  21. 21.27² =
  22. 22.19² =
  23. 23.19² =
  24. 24.29² =
  25. 25.15² =
  26. 26.12² =
  27. 27.28² =
  28. 28.19² =
  29. 29.15² =
  30. 30.22² =
  31. 31.22² =
  32. 32.18² =
  33. 33.21² =
  34. 34.25² =
  35. 35.18² =
  36. 36.25² =
  37. 37.22² =
  38. 38.27² =
  39. 39.21² =
  40. 40.14² =

Answer key

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

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