← Squares up to 30 lesson New set →

Squares 1 to 30 Mental Maths Worksheet

Mental maths lesson 18: Squares up to 30 · Set 77 · 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. 2.22² =
  3. 3.21² =
  4. 4.14² =
  5. 5.19² =
  6. 6.29² =
  7. 7.13² =
  8. 8.27² =
  9. 9.18² =
  10. 10.11² =
  11. 11.17² =
  12. 12.15² =
  13. 13.23² =
  14. 14.24² =
  15. 15.25² =
  16. 16.21² =
  17. 17.26² =
  18. 18.12² =
  19. 19.16² =
  20. 20.21² =
  21. 21.21² =
  22. 22.21² =
  23. 23.18² =
  24. 24.29² =
  25. 25.21² =
  26. 26.15² =
  27. 27.21² =
  28. 28.21² =
  29. 29.21² =
  30. 30.16² =
  31. 31.18² =
  32. 32.19² =
  33. 33.19² =
  34. 34.13² =
  35. 35.18² =
  36. 36.16² =
  37. 37.18² =
  38. 38.14² =
  39. 39.28² =
  40. 40.23² =

Answer key

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

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