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Squares 1 to 30 Mental Maths Worksheet

Mental maths lesson 18: Squares up to 30 · Set 19 · 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. 1.13² =
  2. 2.22² =
  3. 3.15² =
  4. 4.21² =
  5. 5.17² =
  6. 6.23² =
  7. 7.19² =
  8. 8.14² =
  9. 9.11² =
  10. 10.24² =
  11. 11.18² =
  12. 12.29² =
  13. 13.27² =
  14. 14.12² =
  15. 15.28² =
  16. 16.26² =
  17. 17.27² =
  18. 18.19² =
  19. 19.25² =
  20. 20.16² =
  21. 21.25² =
  22. 22.15² =
  23. 23.23² =
  24. 24.16² =
  25. 25.13² =
  26. 26.25² =
  27. 27.15² =
  28. 28.19² =
  29. 29.13² =
  30. 30.14² =
  31. 31.14² =
  32. 32.21² =
  33. 33.11² =
  34. 34.15² =
  35. 35.15² =
  36. 36.16² =
  37. 37.23² =
  38. 38.17² =
  39. 39.21² =
  40. 40.12² =

Answer key

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

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