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Squares 1 to 30 Mental Maths Worksheet

Mental maths lesson 18: Squares up to 30 · Set 171 · 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. 2.11² =
  3. 3.16² =
  4. 4.18² =
  5. 5.17² =
  6. 6.24² =
  7. 7.23² =
  8. 8.14² =
  9. 9.21² =
  10. 10.26² =
  11. 11.22² =
  12. 12.25² =
  13. 13.28² =
  14. 14.15² =
  15. 15.21² =
  16. 16.19² =
  17. 17.12² =
  18. 18.29² =
  19. 19.13² =
  20. 20.21² =
  21. 21.28² =
  22. 22.27² =
  23. 23.12² =
  24. 24.14² =
  25. 25.27² =
  26. 26.13² =
  27. 27.12² =
  28. 28.28² =
  29. 29.18² =
  30. 30.16² =
  31. 31.12² =
  32. 32.16² =
  33. 33.15² =
  34. 34.24² =
  35. 35.18² =
  36. 36.23² =
  37. 37.13² =
  38. 38.12² =
  39. 39.13² =
  40. 40.19² =

Answer key

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

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