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Squares 1 to 30 Mental Maths Worksheet

Mental maths lesson 18: Squares up to 30 · Set 779 · 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. 3.12² =
  4. 4.27² =
  5. 5.23² =
  6. 6.29² =
  7. 7.13² =
  8. 8.11² =
  9. 9.24² =
  10. 10.16² =
  11. 11.28² =
  12. 12.17² =
  13. 13.19² =
  14. 14.22² =
  15. 15.15² =
  16. 16.25² =
  17. 17.18² =
  18. 18.13² =
  19. 19.21² =
  20. 20.18² =
  21. 21.13² =
  22. 22.26² =
  23. 23.13² =
  24. 24.21² =
  25. 25.21² =
  26. 26.16² =
  27. 27.29² =
  28. 28.26² =
  29. 29.13² =
  30. 30.16² =
  31. 31.27² =
  32. 32.16² =
  33. 33.14² =
  34. 34.18² =
  35. 35.11² =
  36. 36.23² =
  37. 37.29² =
  38. 38.21² =
  39. 39.12² =
  40. 40.17² =

Answer key

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

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