![\"\"](\"http://www.mathskey.com/userfiles/image/steps_images/step1.JPG\")
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Method 1:
\Factor the each monomial.
\rs3 = r · s · s · s
\s3t= s · s · s · t
\r2st2= r · r · s · t · t
\The GCF is the product of the common prime factors in each monomial.
\GCF = s
\The greatest common factor of rs3, s3t and r2st2 is s.![\"\"](\"http://www.mathskey.com/userfiles/image/steps_images/solution.JPG\")
The greatest common factor of rs3, s3t and r2st2 is s.