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Squares 1 to 30 Mental Maths Worksheet

Mental maths lesson 18: Squares up to 30 · Set 608 · 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. 2.14² =
  3. 3.11² =
  4. 4.27² =
  5. 5.12² =
  6. 6.25² =
  7. 7.21² =
  8. 8.22² =
  9. 9.15² =
  10. 10.13² =
  11. 11.18² =
  12. 12.17² =
  13. 13.28² =
  14. 14.23² =
  15. 15.26² =
  16. 16.29² =
  17. 17.24² =
  18. 18.15² =
  19. 19.15² =
  20. 20.13² =
  21. 21.11² =
  22. 22.23² =
  23. 23.19² =
  24. 24.21² =
  25. 25.21² =
  26. 26.17² =
  27. 27.17² =
  28. 28.16² =
  29. 29.18² =
  30. 30.18² =
  31. 31.15² =
  32. 32.21² =
  33. 33.17² =
  34. 34.14² =
  35. 35.15² =
  36. 36.27² =
  37. 37.21² =
  38. 38.11² =
  39. 39.29² =
  40. 40.25² =

Answer key

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

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