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Squares 1 to 30 Mental Maths Worksheet

Mental maths lesson 18: Squares up to 30 · Set 789 · 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. 1.16² =
  2. 2.15² =
  3. 3.21² =
  4. 4.29² =
  5. 5.22² =
  6. 6.23² =
  7. 7.13² =
  8. 8.28² =
  9. 9.12² =
  10. 10.24² =
  11. 11.18² =
  12. 12.27² =
  13. 13.11² =
  14. 14.17² =
  15. 15.25² =
  16. 16.11² =
  17. 17.26² =
  18. 18.26² =
  19. 19.17² =
  20. 20.19² =
  21. 21.14² =
  22. 22.16² =
  23. 23.22² =
  24. 24.16² =
  25. 25.15² =
  26. 26.11² =
  27. 27.29² =
  28. 28.26² =
  29. 29.16² =
  30. 30.19² =
  31. 31.12² =
  32. 32.11² =
  33. 33.29² =
  34. 34.16² =
  35. 35.13² =
  36. 36.27² =
  37. 37.18² =
  38. 38.27² =
  39. 39.18² =
  40. 40.21² =

Answer key

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

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