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Squares 1 to 30 Mental Maths Worksheet

Mental maths lesson 18: Squares up to 30 · Set 147 · 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. 3.23² =
  4. 4.13² =
  5. 5.18² =
  6. 6.16² =
  7. 7.28² =
  8. 8.12² =
  9. 9.17² =
  10. 10.25² =
  11. 11.29² =
  12. 12.26² =
  13. 13.15² =
  14. 14.27² =
  15. 15.24² =
  16. 16.14² =
  17. 17.11² =
  18. 18.29² =
  19. 19.22² =
  20. 20.21² =
  21. 21.21² =
  22. 22.14² =
  23. 23.18² =
  24. 24.21² =
  25. 25.14² =
  26. 26.21² =
  27. 27.11² =
  28. 28.14² =
  29. 29.16² =
  30. 30.28² =
  31. 31.27² =
  32. 32.13² =
  33. 33.23² =
  34. 34.13² =
  35. 35.27² =
  36. 36.28² =
  37. 37.17² =
  38. 38.18² =
  39. 39.24² =
  40. 40.17² =

Answer key

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

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