← Squares up to 30 lesson New set →

Squares 1 to 30 Mental Maths Worksheet

Mental maths lesson 18: Squares up to 30 · Set 85 · 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. 2.27² =
  3. 3.15² =
  4. 4.12² =
  5. 5.16² =
  6. 6.19² =
  7. 7.23² =
  8. 8.25² =
  9. 9.17² =
  10. 10.24² =
  11. 11.18² =
  12. 12.21² =
  13. 13.13² =
  14. 14.29² =
  15. 15.22² =
  16. 16.13² =
  17. 17.14² =
  18. 18.26² =
  19. 19.13² =
  20. 20.16² =
  21. 21.21² =
  22. 22.19² =
  23. 23.28² =
  24. 24.14² =
  25. 25.14² =
  26. 26.15² =
  27. 27.21² =
  28. 28.26² =
  29. 29.25² =
  30. 30.18² =
  31. 31.12² =
  32. 32.22² =
  33. 33.11² =
  34. 34.16² =
  35. 35.25² =
  36. 36.21² =
  37. 37.27² =
  38. 38.17² =
  39. 39.29² =
  40. 40.15² =

Answer key

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

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