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Squares 1 to 30 Mental Maths Worksheet

Mental maths lesson 18: Squares up to 30 · Set 783 · 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. 1.19² =
  2. 2.18² =
  3. 3.16² =
  4. 4.17² =
  5. 5.21² =
  6. 6.12² =
  7. 7.13² =
  8. 8.14² =
  9. 9.15² =
  10. 10.28² =
  11. 11.23² =
  12. 12.11² =
  13. 13.22² =
  14. 14.27² =
  15. 15.29² =
  16. 16.24² =
  17. 17.22² =
  18. 18.26² =
  19. 19.25² =
  20. 20.21² =
  21. 21.19² =
  22. 22.21² =
  23. 23.21² =
  24. 24.12² =
  25. 25.25² =
  26. 26.17² =
  27. 27.17² =
  28. 28.22² =
  29. 29.12² =
  30. 30.17² =
  31. 31.22² =
  32. 32.29² =
  33. 33.12² =
  34. 34.21² =
  35. 35.27² =
  36. 36.21² =
  37. 37.13² =
  38. 38.28² =
  39. 39.26² =
  40. 40.29² =

Answer key

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

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