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Squares 1 to 30 Mental Maths Worksheet

Mental maths lesson 18: Squares up to 30 · Set 291 · 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. 1.23² =
  2. 2.22² =
  3. 3.25² =
  4. 4.11² =
  5. 5.18² =
  6. 6.21² =
  7. 7.29² =
  8. 8.16² =
  9. 9.27² =
  10. 10.14² =
  11. 11.26² =
  12. 12.24² =
  13. 13.19² =
  14. 14.28² =
  15. 15.17² =
  16. 16.15² =
  17. 17.13² =
  18. 18.12² =
  19. 19.26² =
  20. 20.15² =
  21. 21.11² =
  22. 22.21² =
  23. 23.11² =
  24. 24.26² =
  25. 25.16² =
  26. 26.19² =
  27. 27.21² =
  28. 28.11² =
  29. 29.19² =
  30. 30.16² =
  31. 31.11² =
  32. 32.13² =
  33. 33.11² =
  34. 34.25² =
  35. 35.28² =
  36. 36.29² =
  37. 37.23² =
  38. 38.24² =
  39. 39.23² =
  40. 40.27² =

Answer key

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

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