← Squares up to 30 lesson New set →

Squares 1 to 30 Mental Maths Worksheet

Mental maths lesson 18: Squares up to 30 · Set 108 · 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. 2.13² =
  3. 3.17² =
  4. 4.19² =
  5. 5.18² =
  6. 6.27² =
  7. 7.16² =
  8. 8.14² =
  9. 9.15² =
  10. 10.28² =
  11. 11.26² =
  12. 12.24² =
  13. 13.11² =
  14. 14.23² =
  15. 15.25² =
  16. 16.22² =
  17. 17.12² =
  18. 18.29² =
  19. 19.14² =
  20. 20.11² =
  21. 21.12² =
  22. 22.16² =
  23. 23.21² =
  24. 24.11² =
  25. 25.11² =
  26. 26.29² =
  27. 27.14² =
  28. 28.21² =
  29. 29.12² =
  30. 30.22² =
  31. 31.12² =
  32. 32.29² =
  33. 33.15² =
  34. 34.17² =
  35. 35.28² =
  36. 36.21² =
  37. 37.15² =
  38. 38.23² =
  39. 39.17² =
  40. 40.11² =

Answer key

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

Free mental maths lessons, practice and worksheets at talentjr.in/mental-maths