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Factor the each monomial.
\10 r = 2 · 5 · r
\25 r4= 5· 5 ·r· r· r· r
\The GCF is the product of the common prime factors in each monomial.
\GCF = m The greatest common factor of 10 r and 25 r4 is 5 · r = 5r.![\"\"](\"http://www.mathskey.com/userfiles/image/steps_images/solution.JPG\")
The greatest common factor of 10 r and 25 r4 is 5r.