GCF and LCM

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Greatest Common Factor and Least Common Multiple of two numbers. Shows factor trees, prime factorizations, and a Venn diagram of shared and unique factors.

GCF (Greatest Common Factor)
12
The biggest number that divides both 24 and 36.
LCM (Least Common Multiple)
72
The smallest number that both 24 and 36 divide into.

Factor tree for 24

Factor tree for 36

Prime factor Venn diagram

Overlap = shared prime factors. Product of overlap = GCF. Product of all (no double-counting) = LCM.