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Squares 1 to 30 Mental Maths Worksheet

Mental maths lesson 18: Squares up to 30 · Set 798 · 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. 2.25² =
  3. 3.15² =
  4. 4.11² =
  5. 5.19² =
  6. 6.13² =
  7. 7.23² =
  8. 8.12² =
  9. 9.24² =
  10. 10.29² =
  11. 11.16² =
  12. 12.22² =
  13. 13.27² =
  14. 14.28² =
  15. 15.26² =
  16. 16.25² =
  17. 17.17² =
  18. 18.14² =
  19. 19.18² =
  20. 20.21² =
  21. 21.28² =
  22. 22.12² =
  23. 23.27² =
  24. 24.29² =
  25. 25.21² =
  26. 26.28² =
  27. 27.25² =
  28. 28.29² =
  29. 29.12² =
  30. 30.26² =
  31. 31.14² =
  32. 32.14² =
  33. 33.11² =
  34. 34.21² =
  35. 35.11² =
  36. 36.15² =
  37. 37.27² =
  38. 38.29² =
  39. 39.17² =
  40. 40.13² =

Answer key

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

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