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Factor the each monomial.
\4rs2 = 2 · 2 · r · s · s
\27st3 = 3 · 3 · 3 · s · t · t · t
\The GCF is the product of the common prime factors in each monomial.
\GCF = s
\The greatest common factor of 4rs2 and 27st3 is s.![\"\"](\"http://www.mathskey.com/userfiles/image/steps_images/solution.JPG\")
The greatest common factor of 4rs2 and 27st3 is s.