← Squares up to 30 lesson New set →

Squares 1 to 30 Mental Maths Worksheet

Mental maths lesson 18: Squares up to 30 · Set 697 · 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. 1.11² =
  2. 2.21² =
  3. 3.27² =
  4. 4.29² =
  5. 5.26² =
  6. 6.18² =
  7. 7.25² =
  8. 8.19² =
  9. 9.24² =
  10. 10.28² =
  11. 11.14² =
  12. 12.16² =
  13. 13.22² =
  14. 14.15² =
  15. 15.12² =
  16. 16.17² =
  17. 17.13² =
  18. 18.23² =
  19. 19.13² =
  20. 20.27² =
  21. 21.13² =
  22. 22.25² =
  23. 23.22² =
  24. 24.29² =
  25. 25.12² =
  26. 26.15² =
  27. 27.27² =
  28. 28.11² =
  29. 29.29² =
  30. 30.29² =
  31. 31.17² =
  32. 32.11² =
  33. 33.11² =
  34. 34.29² =
  35. 35.11² =
  36. 36.19² =
  37. 37.23² =
  38. 38.13² =
  39. 39.15² =
  40. 40.15² =

Answer key

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

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