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Squares 1 to 30 Mental Maths Worksheet

Mental maths lesson 18: Squares up to 30 · Set 47 · 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. 2.27² =
  3. 3.16² =
  4. 4.12² =
  5. 5.14² =
  6. 6.19² =
  7. 7.21² =
  8. 8.17² =
  9. 9.18² =
  10. 10.23² =
  11. 11.11² =
  12. 12.26² =
  13. 13.24² =
  14. 14.28² =
  15. 15.13² =
  16. 16.22² =
  17. 17.28² =
  18. 18.29² =
  19. 19.24² =
  20. 20.27² =
  21. 21.16² =
  22. 22.12² =
  23. 23.22² =
  24. 24.21² =
  25. 25.25² =
  26. 26.13² =
  27. 27.23² =
  28. 28.29² =
  29. 29.26² =
  30. 30.11² =
  31. 31.13² =
  32. 32.11² =
  33. 33.29² =
  34. 34.12² =
  35. 35.18² =
  36. 36.26² =
  37. 37.19² =
  38. 38.11² =
  39. 39.21² =
  40. 40.19² =

Answer key

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

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