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Squares 1 to 30 Mental Maths Worksheet

Mental maths lesson 18: Squares up to 30 · Set 639 · 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. 1.15² =
  2. 2.21² =
  3. 3.17² =
  4. 4.24² =
  5. 5.27² =
  6. 6.14² =
  7. 7.18² =
  8. 8.25² =
  9. 9.12² =
  10. 10.22² =
  11. 11.28² =
  12. 12.13² =
  13. 13.29² =
  14. 14.16² =
  15. 15.23² =
  16. 16.26² =
  17. 17.19² =
  18. 18.11² =
  19. 19.14² =
  20. 20.18² =
  21. 21.11² =
  22. 22.11² =
  23. 23.18² =
  24. 24.22² =
  25. 25.18² =
  26. 26.15² =
  27. 27.19² =
  28. 28.23² =
  29. 29.21² =
  30. 30.25² =
  31. 31.24² =
  32. 32.23² =
  33. 33.26² =
  34. 34.12² =
  35. 35.11² =
  36. 36.19² =
  37. 37.15² =
  38. 38.11² =
  39. 39.29² =
  40. 40.28² =

Answer key

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

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