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Squares 1 to 30 Mental Maths Worksheet

Mental maths lesson 18: Squares up to 30 · Set 775 · 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. 2.11² =
  3. 3.13² =
  4. 4.16² =
  5. 5.25² =
  6. 6.17² =
  7. 7.26² =
  8. 8.18² =
  9. 9.23² =
  10. 10.15² =
  11. 11.29² =
  12. 12.14² =
  13. 13.24² =
  14. 14.27² =
  15. 15.22² =
  16. 16.12² =
  17. 17.28² =
  18. 18.19² =
  19. 19.18² =
  20. 20.25² =
  21. 21.12² =
  22. 22.12² =
  23. 23.13² =
  24. 24.12² =
  25. 25.11² =
  26. 26.13² =
  27. 27.23² =
  28. 28.19² =
  29. 29.24² =
  30. 30.16² =
  31. 31.27² =
  32. 32.29² =
  33. 33.22² =
  34. 34.13² =
  35. 35.16² =
  36. 36.27² =
  37. 37.13² =
  38. 38.27² =
  39. 39.25² =
  40. 40.18² =

Answer key

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

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