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Squares 1 to 30 Mental Maths Worksheet

Mental maths lesson 18: Squares up to 30 · Set 97 · 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. 2.16² =
  3. 3.29² =
  4. 4.15² =
  5. 5.28² =
  6. 6.14² =
  7. 7.26² =
  8. 8.13² =
  9. 9.24² =
  10. 10.22² =
  11. 11.19² =
  12. 12.27² =
  13. 13.11² =
  14. 14.23² =
  15. 15.17² =
  16. 16.25² =
  17. 17.12² =
  18. 18.14² =
  19. 19.18² =
  20. 20.21² =
  21. 21.11² =
  22. 22.28² =
  23. 23.28² =
  24. 24.26² =
  25. 25.11² =
  26. 26.25² =
  27. 27.22² =
  28. 28.13² =
  29. 29.29² =
  30. 30.12² =
  31. 31.29² =
  32. 32.24² =
  33. 33.28² =
  34. 34.24² =
  35. 35.12² =
  36. 36.21² =
  37. 37.23² =
  38. 38.17² =
  39. 39.11² =
  40. 40.19² =

Answer key

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

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