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Squares 1 to 30 Mental Maths Worksheet

Mental maths lesson 18: Squares up to 30 · Set 145 · 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. 1.21² =
  2. 2.25² =
  3. 3.19² =
  4. 4.29² =
  5. 5.26² =
  6. 6.23² =
  7. 7.28² =
  8. 8.12² =
  9. 9.17² =
  10. 10.15² =
  11. 11.22² =
  12. 12.27² =
  13. 13.24² =
  14. 14.14² =
  15. 15.16² =
  16. 16.21² =
  17. 17.11² =
  18. 18.13² =
  19. 19.18² =
  20. 20.21² =
  21. 21.19² =
  22. 22.21² =
  23. 23.24² =
  24. 24.17² =
  25. 25.19² =
  26. 26.13² =
  27. 27.13² =
  28. 28.29² =
  29. 29.15² =
  30. 30.25² =
  31. 31.21² =
  32. 32.13² =
  33. 33.17² =
  34. 34.12² =
  35. 35.22² =
  36. 36.16² =
  37. 37.13² =
  38. 38.22² =
  39. 39.23² =
  40. 40.17² =

Answer key

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

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