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Squares 1 to 30 Mental Maths Worksheet

Mental maths lesson 18: Squares up to 30 · Set 71 · 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. 2.17² =
  3. 3.28² =
  4. 4.21² =
  5. 5.19² =
  6. 6.14² =
  7. 7.23² =
  8. 8.26² =
  9. 9.22² =
  10. 10.11² =
  11. 11.18² =
  12. 12.12² =
  13. 13.24² =
  14. 14.29² =
  15. 15.25² =
  16. 16.27² =
  17. 17.13² =
  18. 18.24² =
  19. 19.15² =
  20. 20.16² =
  21. 21.13² =
  22. 22.16² =
  23. 23.22² =
  24. 24.21² =
  25. 25.29² =
  26. 26.21² =
  27. 27.29² =
  28. 28.26² =
  29. 29.23² =
  30. 30.18² =
  31. 31.22² =
  32. 32.13² =
  33. 33.17² =
  34. 34.21² =
  35. 35.14² =
  36. 36.13² =
  37. 37.29² =
  38. 38.22² =
  39. 39.13² =
  40. 40.14² =

Answer key

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

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