Free GCF & LCM Worksheets

Find the greatest common factor (GCF) and least common multiple (LCM) of two numbers. Adjustable number size.

Difficulty levels: GCF up to 100 · LCM up to 20

Aligned standards

Generate a GCF & LCM Worksheet

Pick a version below — each one is randomly generated, so you can make as many unique copies as you need.

Activity:

Greatest Common Factor

GCF (numbers up to 12)

GCF (numbers up to 25)

GCF (numbers up to 50)

GCF (numbers up to 100)

Least Common Multiple

LCM (numbers up to 6)

LCM (numbers up to 10)

LCM (numbers up to 12)

LCM (numbers up to 15)

LCM (numbers up to 20)

GCF & LCM Mixed

GCF & LCM (to standard)

GCF & LCM (smaller numbers)

Choose your own difficulty, problem style, and mix in other concepts.