FreeMath
Grade 5medium

Least Common Multiple (LCM) Practice

Practice finding the Least Common Multiple (LCM) of two numbers. The LCM is the smallest number that is a multiple of both numbers.

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All 20 Practice Problems

Every question in this set. Solve them on paper, or use the interactive tool above for instant feedback and hints.

  1. 1.Find the LCM of 4 and 6
  2. 2.Find the LCM of 5 and 7
  3. 3.Find the LCM of 6 and 8
  4. 4.Find the LCM of 8 and 12
  5. 5.Find the LCM of 9 and 12
  6. 6.Find the LCM of 10 and 15
  7. 7.Find the LCM of 12 and 16
  8. 8.Find the LCM of 14 and 21
  9. 9.Find the LCM of 15 and 20
  10. 10.Find the LCM of 18 and 24
  11. 11.Find the LCM of 3 and 5
  12. 12.Find the LCM of 4 and 10
  13. 13.Find the LCM of 6 and 9
  14. 14.Find the LCM of 7 and 8
  15. 15.Find the LCM of 8 and 10
  16. 16.Find the LCM of 9 and 15
  17. 17.Find the LCM of 10 and 12
  18. 18.Find the LCM of 12 and 18
  19. 19.Find the LCM of 15 and 25
  20. 20.Find the LCM of 20 and 30
Show answer key
  1. 1.Find the LCM of 4 and 6 Answer: 12
  2. 2.Find the LCM of 5 and 7 Answer: 35
  3. 3.Find the LCM of 6 and 8 Answer: 24
  4. 4.Find the LCM of 8 and 12 Answer: 24
  5. 5.Find the LCM of 9 and 12 Answer: 36
  6. 6.Find the LCM of 10 and 15 Answer: 30
  7. 7.Find the LCM of 12 and 16 Answer: 48
  8. 8.Find the LCM of 14 and 21 Answer: 42
  9. 9.Find the LCM of 15 and 20 Answer: 60
  10. 10.Find the LCM of 18 and 24 Answer: 72
  11. 11.Find the LCM of 3 and 5 Answer: 15
  12. 12.Find the LCM of 4 and 10 Answer: 20
  13. 13.Find the LCM of 6 and 9 Answer: 18
  14. 14.Find the LCM of 7 and 8 Answer: 56
  15. 15.Find the LCM of 8 and 10 Answer: 40
  16. 16.Find the LCM of 9 and 15 Answer: 45
  17. 17.Find the LCM of 10 and 12 Answer: 60
  18. 18.Find the LCM of 12 and 18 Answer: 36
  19. 19.Find the LCM of 15 and 25 Answer: 75
  20. 20.Find the LCM of 20 and 30 Answer: 60

About This Practice

This practice set includes 20 LCM problems. Finding the LCM is essential for adding fractions with different denominators and solving scheduling problems.

Want more practice? See all Grade 5 practice →