← HCF and LCM lesson New set →

HCF and LCM Worksheet

Quantitative aptitude lesson 1: HCF and LCM · Set 539 · 40 questions
TalentJR

The method (Prime factors): Write each number as a product of primes: 36 = 2 × 2 × 3 × 3. HCF: multiply the primes the numbers share (each as many times as it appears in both). LCM: take every prime the greatest number of times it appears. For two numbers, HCF × LCM = first number × second number.

NameDateTime takenScore ___ / 40
  1. 1.Find the LCM of 15, 2 and 10.
  2. 2.Find the LCM of 7 and 4.
  3. 3.Find the HCF of 22 and 55.
  4. 4.Find the LCM of 9 and 7.
  5. 5.Find the HCF of 20 and 36.
  6. 6.Find the HCF of 105 and 45.
  7. 7.Find the HCF of 81 and 63.
  8. 8.Find the LCM of 8 and 12.
  9. 9.Find the HCF of 12 and 18.
  10. 10.Find the LCM of 16 and 20.
  11. 11.Find the HCF of 56 and 70.
  12. 12.Find the LCM of 15 and 20.
  13. 13.Find the LCM of 9, 8 and 4.
  14. 14.Find the LCM of 18 and 16.
  15. 15.Find the LCM of 8 and 9.
  16. 16.Find the HCF of 33 and 55.
  17. 17.Find the LCM of 5, 3 and 8.
  18. 18.Find the LCM of 10, 8 and 12.
  19. 19.Find the LCM of 3 and 2.
  20. 20.Find the HCF of 22 and 99.
  21. 21.Find the LCM of 12, 9 and 3.
  22. 22.Find the LCM of 16 and 36.
  23. 23.Find the LCM of 5, 10 and 2.
  24. 24.Find the HCF of 14 and 12.
  25. 25.Find the LCM of 15, 4 and 10.
  26. 26.Find the HCF of 18 and 8.
  27. 27.The HCF of two numbers is 7 and their LCM is 168. One of the numbers is 21. What is the other number?
  28. 28.Find the HCF of 30 and 135.
  29. 29.Find the HCF of 108 and 96.
  30. 30.Find the LCM of 7, 2 and 13.
  31. 31.Find the LCM of 7, 6 and 2.
  32. 32.Find the LCM of 15 and 35.
  33. 33.Find the LCM of 3, 5 and 10.
  34. 34.Find the LCM of 4, 10 and 11.
  35. 35.Find the LCM of 9, 6 and 3.
  36. 36.Find the LCM of 42 and 54.
  37. 37.Find the LCM of 5 and 6.
  38. 38.Find the HCF of 14 and 21.
  39. 39.The HCF of two numbers is 2 and their LCM is 90. One of the numbers is 18. What is the other number?
  40. 40.Find the LCM of 6, 14 and 7.

Answer key

  1. 30
  2. 28
  3. 11
  4. 63
  5. 4
  6. 15
  7. 9
  8. 24
  9. 6
  10. 80
  11. 14
  12. 60
  13. 72
  14. 144
  15. 72
  16. 11
  17. 120
  18. 120
  19. 6
  20. 11
  21. 36
  22. 144
  23. 10
  24. 2
  25. 60
  26. 2
  27. 56
  28. 15
  29. 12
  30. 182
  31. 42
  32. 105
  33. 30
  34. 220
  35. 18
  36. 378
  37. 30
  38. 7
  39. 10
  40. 42

Free quantitative aptitude lessons, practice and worksheets at talentjr.in/quantitative-aptitude