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Squares 1 to 30 Mental Maths Worksheet

Mental maths lesson 18: Squares up to 30 · Set 79 · 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. 2.27² =
  3. 3.11² =
  4. 4.14² =
  5. 5.23² =
  6. 6.21² =
  7. 7.15² =
  8. 8.17² =
  9. 9.22² =
  10. 10.13² =
  11. 11.29² =
  12. 12.16² =
  13. 13.28² =
  14. 14.26² =
  15. 15.21² =
  16. 16.24² =
  17. 17.18² =
  18. 18.25² =
  19. 19.12² =
  20. 20.28² =
  21. 21.22² =
  22. 22.18² =
  23. 23.22² =
  24. 24.13² =
  25. 25.28² =
  26. 26.28² =
  27. 27.27² =
  28. 28.26² =
  29. 29.25² =
  30. 30.21² =
  31. 31.24² =
  32. 32.16² =
  33. 33.11² =
  34. 34.21² =
  35. 35.12² =
  36. 36.17² =
  37. 37.22² =
  38. 38.12² =
  39. 39.27² =
  40. 40.27² =

Answer key

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

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