GCF & LCM worksheets
GCF and LCM worksheets give your child practice finding the greatest common factor of pairs up to 100 and the least common multiple of pairs up to 12, the skill 6th grade uses to factor expressions and add unlike fractions.
By grade
What students need to know
The GCF is the biggest number that divides into both numbers, and the LCM is the smallest number they both divide into.
This skill runs from 6th grade through 6th grade. Pick a grade above for level-matched sentences, teaching notes, and worksheets.
GCF & LCM across the grades
6th grade
GCF and LCM worksheets give your child practice finding the greatest common factor of pairs up to 100 and the least common multiple of pairs up to 12, the skill 6th grade uses to factor expressions and add unlike fractions.
All factors & patterns worksheets →
Or all math worksheets: every grade, every topic.