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Squares 1 to 30 Mental Maths Worksheet

Mental maths lesson 18: Squares up to 30 · Set 247 · 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. 1.16² =
  2. 2.15² =
  3. 3.25² =
  4. 4.18² =
  5. 5.13² =
  6. 6.21² =
  7. 7.23² =
  8. 8.29² =
  9. 9.12² =
  10. 10.19² =
  11. 11.28² =
  12. 12.11² =
  13. 13.14² =
  14. 14.27² =
  15. 15.17² =
  16. 16.22² =
  17. 17.19² =
  18. 18.28² =
  19. 19.21² =
  20. 20.25² =
  21. 21.24² =
  22. 22.26² =
  23. 23.12² =
  24. 24.28² =
  25. 25.17² =
  26. 26.15² =
  27. 27.22² =
  28. 28.17² =
  29. 29.17² =
  30. 30.26² =
  31. 31.23² =
  32. 32.26² =
  33. 33.15² =
  34. 34.29² =
  35. 35.23² =
  36. 36.14² =
  37. 37.17² =
  38. 38.29² =
  39. 39.21² =
  40. 40.29² =

Answer key

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

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