← Squares up to 30 lesson New set →

Squares 1 to 30 Mental Maths Worksheet

Mental maths lesson 18: Squares up to 30 · Set 568 · 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. 1.15² =
  2. 2.24² =
  3. 3.17² =
  4. 4.27² =
  5. 5.19² =
  6. 6.26² =
  7. 7.14² =
  8. 8.28² =
  9. 9.13² =
  10. 10.11² =
  11. 11.23² =
  12. 12.18² =
  13. 13.22² =
  14. 14.16² =
  15. 15.21² =
  16. 16.17² =
  17. 17.29² =
  18. 18.12² =
  19. 19.25² =
  20. 20.15² =
  21. 21.27² =
  22. 22.29² =
  23. 23.12² =
  24. 24.21² =
  25. 25.28² =
  26. 26.26² =
  27. 27.14² =
  28. 28.17² =
  29. 29.12² =
  30. 30.27² =
  31. 31.26² =
  32. 32.25² =
  33. 33.12² =
  34. 34.12² =
  35. 35.29² =
  36. 36.14² =
  37. 37.25² =
  38. 38.12² =
  39. 39.14² =
  40. 40.25² =

Answer key

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

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