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Squares 1 to 30 Mental Maths Worksheet

Mental maths lesson 18: Squares up to 30 · Set 843 · 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. 1.27² =
  2. 2.18² =
  3. 3.21² =
  4. 4.23² =
  5. 5.17² =
  6. 6.13² =
  7. 7.22² =
  8. 8.26² =
  9. 9.16² =
  10. 10.25² =
  11. 11.14² =
  12. 12.11² =
  13. 13.28² =
  14. 14.24² =
  15. 15.12² =
  16. 16.15² =
  17. 17.23² =
  18. 18.29² =
  19. 19.19² =
  20. 20.27² =
  21. 21.13² =
  22. 22.19² =
  23. 23.19² =
  24. 24.17² =
  25. 25.16² =
  26. 26.17² =
  27. 27.11² =
  28. 28.28² =
  29. 29.27² =
  30. 30.16² =
  31. 31.11² =
  32. 32.15² =
  33. 33.22² =
  34. 34.23² =
  35. 35.22² =
  36. 36.21² =
  37. 37.29² =
  38. 38.29² =
  39. 39.21² =
  40. 40.21² =

Answer key

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

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