← Squares up to 30 lesson New set →

Squares 1 to 30 Mental Maths Worksheet

Mental maths lesson 18: Squares up to 30 · Set 811 · 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. 1.12² =
  2. 2.11² =
  3. 3.28² =
  4. 4.29² =
  5. 5.21² =
  6. 6.25² =
  7. 7.23² =
  8. 8.22² =
  9. 9.26² =
  10. 10.15² =
  11. 11.14² =
  12. 12.13² =
  13. 13.17² =
  14. 14.27² =
  15. 15.24² =
  16. 16.18² =
  17. 17.16² =
  18. 18.21² =
  19. 19.27² =
  20. 20.21² =
  21. 21.19² =
  22. 22.15² =
  23. 23.15² =
  24. 24.18² =
  25. 25.24² =
  26. 26.22² =
  27. 27.13² =
  28. 28.22² =
  29. 29.28² =
  30. 30.28² =
  31. 31.19² =
  32. 32.24² =
  33. 33.15² =
  34. 34.17² =
  35. 35.14² =
  36. 36.21² =
  37. 37.13² =
  38. 38.13² =
  39. 39.17² =
  40. 40.11² =

Answer key

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

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