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Squares 1 to 30 Mental Maths Worksheet

Mental maths lesson 18: Squares up to 30 · Set 423 · 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. 2.13² =
  3. 3.19² =
  4. 4.27² =
  5. 5.14² =
  6. 6.21² =
  7. 7.29² =
  8. 8.26² =
  9. 9.11² =
  10. 10.17² =
  11. 11.24² =
  12. 12.12² =
  13. 13.15² =
  14. 14.16² =
  15. 15.18² =
  16. 16.28² =
  17. 17.25² =
  18. 18.17² =
  19. 19.22² =
  20. 20.29² =
  21. 21.13² =
  22. 22.21² =
  23. 23.14² =
  24. 24.12² =
  25. 25.18² =
  26. 26.17² =
  27. 27.26² =
  28. 28.17² =
  29. 29.19² =
  30. 30.18² =
  31. 31.13² =
  32. 32.19² =
  33. 33.21² =
  34. 34.25² =
  35. 35.29² =
  36. 36.21² =
  37. 37.27² =
  38. 38.18² =
  39. 39.28² =
  40. 40.17² =

Answer key

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

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