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Squares 1 to 30 Mental Maths Worksheet

Mental maths lesson 18: Squares up to 30 · Set 90 · 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. 1.19² =
  2. 2.28² =
  3. 3.27² =
  4. 4.17² =
  5. 5.26² =
  6. 6.25² =
  7. 7.21² =
  8. 8.12² =
  9. 9.29² =
  10. 10.11² =
  11. 11.23² =
  12. 12.22² =
  13. 13.16² =
  14. 14.29² =
  15. 15.24² =
  16. 16.18² =
  17. 17.13² =
  18. 18.12² =
  19. 19.14² =
  20. 20.15² =
  21. 21.28² =
  22. 22.24² =
  23. 23.18² =
  24. 24.27² =
  25. 25.21² =
  26. 26.16² =
  27. 27.23² =
  28. 28.28² =
  29. 29.19² =
  30. 30.12² =
  31. 31.21² =
  32. 32.15² =
  33. 33.25² =
  34. 34.19² =
  35. 35.12² =
  36. 36.27² =
  37. 37.13² =
  38. 38.16² =
  39. 39.15² =
  40. 40.11² =

Answer key

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

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