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Squares 1 to 30 Mental Maths Worksheet

Mental maths lesson 18: Squares up to 30 · Set 491 · 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. 1.27² =
  2. 2.18² =
  3. 3.13² =
  4. 4.23² =
  5. 5.16² =
  6. 6.26² =
  7. 7.12² =
  8. 8.29² =
  9. 9.19² =
  10. 10.22² =
  11. 11.28² =
  12. 12.14² =
  13. 13.21² =
  14. 14.24² =
  15. 15.25² =
  16. 16.15² =
  17. 17.21² =
  18. 18.17² =
  19. 19.11² =
  20. 20.22² =
  21. 21.28² =
  22. 22.22² =
  23. 23.19² =
  24. 24.22² =
  25. 25.15² =
  26. 26.22² =
  27. 27.21² =
  28. 28.19² =
  29. 29.15² =
  30. 30.16² =
  31. 31.11² =
  32. 32.29² =
  33. 33.24² =
  34. 34.23² =
  35. 35.11² =
  36. 36.15² =
  37. 37.15² =
  38. 38.28² =
  39. 39.21² =
  40. 40.12² =

Answer key

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

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