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Squares 1 to 30 Mental Maths Worksheet

Mental maths lesson 18: Squares up to 30 · Set 272 · 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. 1.25² =
  2. 2.23² =
  3. 3.17² =
  4. 4.12² =
  5. 5.14² =
  6. 6.11² =
  7. 7.19² =
  8. 8.16² =
  9. 9.28² =
  10. 10.24² =
  11. 11.29² =
  12. 12.22² =
  13. 13.21² =
  14. 14.13² =
  15. 15.21² =
  16. 16.18² =
  17. 17.26² =
  18. 18.27² =
  19. 19.26² =
  20. 20.15² =
  21. 21.21² =
  22. 22.11² =
  23. 23.21² =
  24. 24.19² =
  25. 25.21² =
  26. 26.23² =
  27. 27.17² =
  28. 28.17² =
  29. 29.24² =
  30. 30.16² =
  31. 31.23² =
  32. 32.14² =
  33. 33.21² =
  34. 34.25² =
  35. 35.21² =
  36. 36.13² =
  37. 37.23² =
  38. 38.11² =
  39. 39.23² =
  40. 40.19² =

Answer key

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

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