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Squares 1 to 30 Mental Maths Worksheet

Mental maths lesson 18: Squares up to 30 · Set 306 · 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. 2.22² =
  3. 3.11² =
  4. 4.16² =
  5. 5.28² =
  6. 6.17² =
  7. 7.18² =
  8. 8.24² =
  9. 9.19² =
  10. 10.27² =
  11. 11.26² =
  12. 12.15² =
  13. 13.29² =
  14. 14.23² =
  15. 15.12² =
  16. 16.14² =
  17. 17.13² =
  18. 18.13² =
  19. 19.25² =
  20. 20.13² =
  21. 21.21² =
  22. 22.12² =
  23. 23.26² =
  24. 24.12² =
  25. 25.23² =
  26. 26.21² =
  27. 27.21² =
  28. 28.15² =
  29. 29.23² =
  30. 30.21² =
  31. 31.19² =
  32. 32.13² =
  33. 33.18² =
  34. 34.12² =
  35. 35.17² =
  36. 36.11² =
  37. 37.28² =
  38. 38.23² =
  39. 39.23² =
  40. 40.16² =

Answer key

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

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