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Squares 1 to 30 Mental Maths Worksheet

Mental maths lesson 18: Squares up to 30 · Set 443 · 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. 2.19² =
  3. 3.15² =
  4. 4.11² =
  5. 5.14² =
  6. 6.23² =
  7. 7.17² =
  8. 8.22² =
  9. 9.28² =
  10. 10.13² =
  11. 11.24² =
  12. 12.27² =
  13. 13.18² =
  14. 14.25² =
  15. 15.26² =
  16. 16.18² =
  17. 17.16² =
  18. 18.12² =
  19. 19.11² =
  20. 20.29² =
  21. 21.18² =
  22. 22.15² =
  23. 23.11² =
  24. 24.19² =
  25. 25.21² =
  26. 26.11² =
  27. 27.14² =
  28. 28.19² =
  29. 29.11² =
  30. 30.21² =
  31. 31.21² =
  32. 32.24² =
  33. 33.12² =
  34. 34.21² =
  35. 35.26² =
  36. 36.27² =
  37. 37.13² =
  38. 38.17² =
  39. 39.23² =
  40. 40.24² =

Answer key

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

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