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Squares 1 to 30 Mental Maths Worksheet

Mental maths lesson 18: Squares up to 30 · Set 83 · 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. 1.11² =
  2. 2.23² =
  3. 3.25² =
  4. 4.13² =
  5. 5.27² =
  6. 6.18² =
  7. 7.21² =
  8. 8.19² =
  9. 9.22² =
  10. 10.15² =
  11. 11.14² =
  12. 12.24² =
  13. 13.26² =
  14. 14.17² =
  15. 15.29² =
  16. 16.16² =
  17. 17.21² =
  18. 18.12² =
  19. 19.27² =
  20. 20.29² =
  21. 21.21² =
  22. 22.28² =
  23. 23.11² =
  24. 24.24² =
  25. 25.29² =
  26. 26.24² =
  27. 27.28² =
  28. 28.26² =
  29. 29.14² =
  30. 30.27² =
  31. 31.11² =
  32. 32.21² =
  33. 33.18² =
  34. 34.21² =
  35. 35.15² =
  36. 36.28² =
  37. 37.16² =
  38. 38.11² =
  39. 39.15² =
  40. 40.21² =

Answer key

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

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