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Squares 1 to 30 Mental Maths Worksheet

Mental maths lesson 18: Squares up to 30 · Set 281 · 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. 1.21² =
  2. 2.13² =
  3. 3.14² =
  4. 4.17² =
  5. 5.29² =
  6. 6.15² =
  7. 7.23² =
  8. 8.27² =
  9. 9.11² =
  10. 10.26² =
  11. 11.16² =
  12. 12.24² =
  13. 13.12² =
  14. 14.28² =
  15. 15.22² =
  16. 16.18² =
  17. 17.21² =
  18. 18.19² =
  19. 19.25² =
  20. 20.24² =
  21. 21.29² =
  22. 22.26² =
  23. 23.21² =
  24. 24.21² =
  25. 25.18² =
  26. 26.21² =
  27. 27.18² =
  28. 28.27² =
  29. 29.13² =
  30. 30.23² =
  31. 31.17² =
  32. 32.22² =
  33. 33.12² =
  34. 34.27² =
  35. 35.21² =
  36. 36.29² =
  37. 37.12² =
  38. 38.24² =
  39. 39.21² =
  40. 40.11² =

Answer key

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

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