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Squares 1 to 30 Mental Maths Worksheet

Mental maths lesson 18: Squares up to 30 · Set 888 · 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. 2.25² =
  3. 3.15² =
  4. 4.14² =
  5. 5.13² =
  6. 6.24² =
  7. 7.11² =
  8. 8.16² =
  9. 9.12² =
  10. 10.26² =
  11. 11.17² =
  12. 12.27² =
  13. 13.29² =
  14. 14.23² =
  15. 15.28² =
  16. 16.18² =
  17. 17.22² =
  18. 18.19² =
  19. 19.17² =
  20. 20.28² =
  21. 21.19² =
  22. 22.16² =
  23. 23.21² =
  24. 24.19² =
  25. 25.21² =
  26. 26.29² =
  27. 27.29² =
  28. 28.13² =
  29. 29.26² =
  30. 30.19² =
  31. 31.16² =
  32. 32.29² =
  33. 33.22² =
  34. 34.14² =
  35. 35.24² =
  36. 36.15² =
  37. 37.18² =
  38. 38.14² =
  39. 39.26² =
  40. 40.11² =

Answer key

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

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