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Squares 1 to 30 Mental Maths Worksheet

Mental maths lesson 18: Squares up to 30 · Set 505 · 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. 1.12² =
  2. 2.11² =
  3. 3.16² =
  4. 4.26² =
  5. 5.24² =
  6. 6.18² =
  7. 7.17² =
  8. 8.13² =
  9. 9.25² =
  10. 10.23² =
  11. 11.14² =
  12. 12.19² =
  13. 13.28² =
  14. 14.15² =
  15. 15.21² =
  16. 16.29² =
  17. 17.27² =
  18. 18.22² =
  19. 19.15² =
  20. 20.22² =
  21. 21.19² =
  22. 22.27² =
  23. 23.21² =
  24. 24.27² =
  25. 25.12² =
  26. 26.19² =
  27. 27.25² =
  28. 28.21² =
  29. 29.24² =
  30. 30.29² =
  31. 31.19² =
  32. 32.11² =
  33. 33.14² =
  34. 34.14² =
  35. 35.12² =
  36. 36.16² =
  37. 37.23² =
  38. 38.18² =
  39. 39.21² =
  40. 40.21² =

Answer key

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

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