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Integers and factors · Grades 5 to 6

Least common multiple worksheet generator

Make least common multiple worksheets with pairs of numbers up to 12, pairs up to 30, or sets of three. The answer key gives the LCM for each set.

Least common multipleLetter 8.5 × 11 in · answer key on the last page
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Least common multiple
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Find the least common multiple (LCM) of each set of numbers.

  1. 1.LCM(6, 11) =
  2. 2.LCM(4, 12) =
  3. 3.LCM(12, 11) =
  4. 4.LCM(7, 11) =
  5. 5.LCM(9, 4) =
  6. 6.LCM(4, 3) =
  7. 7.LCM(2, 4) =
  8. 8.LCM(12, 2) =
  9. 9.LCM(9, 6) =
  10. 10.LCM(4, 6) =
  11. 11.LCM(9, 7) =
  12. 12.LCM(12, 8) =
  13. 13.LCM(4, 5) =
  14. 14.LCM(6, 2) =
  15. 15.LCM(8, 12) =
  16. 16.LCM(7, 10) =
  17. 17.LCM(6, 7) =
  18. 18.LCM(10, 8) =
  19. 19.LCM(11, 6) =
  20. 20.LCM(12, 9) =
nation1.netSheet 100918401
Least common multiple
Answer key
  1. 1.LCM(6, 11) =66
  2. 2.LCM(4, 12) =12
  3. 3.LCM(12, 11) =132
  4. 4.LCM(7, 11) =77
  5. 5.LCM(9, 4) =36
  6. 6.LCM(4, 3) =12
  7. 7.LCM(2, 4) =4
  8. 8.LCM(12, 2) =12
  9. 9.LCM(9, 6) =18
  10. 10.LCM(4, 6) =12
  11. 11.LCM(9, 7) =63
  12. 12.LCM(12, 8) =24
  13. 13.LCM(4, 5) =20
  14. 14.LCM(6, 2) =6
  15. 15.LCM(8, 12) =24
  16. 16.LCM(7, 10) =70
  17. 17.LCM(6, 7) =42
  18. 18.LCM(10, 8) =40
  19. 19.LCM(11, 6) =66
  20. 20.LCM(12, 9) =36
nation1.netSheet 100918401 ยท answers
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About this worksheet

The LCM is the smallest number both numbers divide into. Listing multiples works for small numbers; prime factorization (take each prime the most times it appears) is faster for bigger ones.

Teaching tip

Point out that the LCM is the least common denominator students need for adding fractions with unlike denominators.

How to use the generator

Change the settings and the sheet updates as you go. New worksheet gives a fresh set of problems with a new answer key. Print or save PDF opens your browser's print window: pick Letter paper and 100% scale, or Save as PDF to keep a copy.