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Squares 1 to 30 Mental Maths Worksheet

Mental maths lesson 18: Squares up to 30 · Set 436 · 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. 2.23² =
  3. 3.29² =
  4. 4.16² =
  5. 5.11² =
  6. 6.17² =
  7. 7.27² =
  8. 8.28² =
  9. 9.12² =
  10. 10.14² =
  11. 11.15² =
  12. 12.22² =
  13. 13.13² =
  14. 14.18² =
  15. 15.23² =
  16. 16.19² =
  17. 17.25² =
  18. 18.26² =
  19. 19.25² =
  20. 20.26² =
  21. 21.12² =
  22. 22.21² =
  23. 23.29² =
  24. 24.19² =
  25. 25.12² =
  26. 26.24² =
  27. 27.11² =
  28. 28.26² =
  29. 29.13² =
  30. 30.21² =
  31. 31.13² =
  32. 32.23² =
  33. 33.21² =
  34. 34.13² =
  35. 35.19² =
  36. 36.25² =
  37. 37.13² =
  38. 38.17² =
  39. 39.28² =
  40. 40.11² =

Answer key

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

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