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Method 1:
\Factor the each monomial.
\4st = 2 · 2 · s · t
\\
10s = 2 · 5 · s
\The GCF is the product of the common prime factors in each monomial.
\GCF = 2 · s = 2s
\The greatest common factor of 4st and 10s is 2s.
\![\"\"](\"http://www.mathskey.com/userfiles/image/steps_images/solution.JPG\")
The greatest common factor of 4st and 10s is 2s.
\\ \