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Squares 1 to 30 Mental Maths Worksheet

Mental maths lesson 18: Squares up to 30 · Set 49 · 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. 1.15² =
  2. 2.18² =
  3. 3.17² =
  4. 4.21² =
  5. 5.16² =
  6. 6.27² =
  7. 7.14² =
  8. 8.19² =
  9. 9.26² =
  10. 10.13² =
  11. 11.25² =
  12. 12.12² =
  13. 13.11² =
  14. 14.29² =
  15. 15.24² =
  16. 16.22² =
  17. 17.18² =
  18. 18.28² =
  19. 19.23² =
  20. 20.16² =
  21. 21.17² =
  22. 22.16² =
  23. 23.22² =
  24. 24.14² =
  25. 25.25² =
  26. 26.18² =
  27. 27.15² =
  28. 28.27² =
  29. 29.22² =
  30. 30.25² =
  31. 31.11² =
  32. 32.14² =
  33. 33.15² =
  34. 34.16² =
  35. 35.29² =
  36. 36.15² =
  37. 37.17² =
  38. 38.15² =
  39. 39.12² =
  40. 40.13² =

Answer key

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

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