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Squares 1 to 30 Mental Maths Worksheet

Mental maths lesson 18: Squares up to 30 · Set 228 · 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. 1.28² =
  2. 2.21² =
  3. 3.25² =
  4. 4.15² =
  5. 5.16² =
  6. 6.18² =
  7. 7.27² =
  8. 8.23² =
  9. 9.12² =
  10. 10.13² =
  11. 11.14² =
  12. 12.24² =
  13. 13.19² =
  14. 14.26² =
  15. 15.11² =
  16. 16.22² =
  17. 17.29² =
  18. 18.21² =
  19. 19.17² =
  20. 20.15² =
  21. 21.16² =
  22. 22.11² =
  23. 23.17² =
  24. 24.17² =
  25. 25.16² =
  26. 26.27² =
  27. 27.17² =
  28. 28.27² =
  29. 29.17² =
  30. 30.13² =
  31. 31.28² =
  32. 32.27² =
  33. 33.15² =
  34. 34.18² =
  35. 35.14² =
  36. 36.21² =
  37. 37.15² =
  38. 38.29² =
  39. 39.24² =
  40. 40.14² =

Answer key

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

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