← Squares up to 30 lesson New set →

Squares 1 to 30 Mental Maths Worksheet

Mental maths lesson 18: Squares up to 30 · Set 997 · 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. 1.28² =
  2. 2.14² =
  3. 3.18² =
  4. 4.11² =
  5. 5.15² =
  6. 6.26² =
  7. 7.22² =
  8. 8.21² =
  9. 9.27² =
  10. 10.17² =
  11. 11.23² =
  12. 12.29² =
  13. 13.19² =
  14. 14.16² =
  15. 15.25² =
  16. 16.12² =
  17. 17.13² =
  18. 18.24² =
  19. 19.17² =
  20. 20.21² =
  21. 21.27² =
  22. 22.22² =
  23. 23.15² =
  24. 24.21² =
  25. 25.14² =
  26. 26.14² =
  27. 27.18² =
  28. 28.23² =
  29. 29.24² =
  30. 30.23² =
  31. 31.15² =
  32. 32.21² =
  33. 33.19² =
  34. 34.21² =
  35. 35.23² =
  36. 36.21² =
  37. 37.26² =
  38. 38.12² =
  39. 39.14² =
  40. 40.18² =

Answer key

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

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