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Method 1:
\Factor the each monomial.
\5m = 5 · m
\20m3 = 2 · 2 · 5 · m · m · m
\The GCF is the product of the common prime factors in each monomial.
\GCF = 5 · m
\The greatest common factor of 5m and 20m3 is 5m.![\"\"](\"http://www.mathskey.com/userfiles/image/steps_images/solution.JPG\")
The greatest common factor of 5m and 20m3 is 5m.