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Method 1:
\Factor the each monomial.
\2y = 2 · y
\10y2 = 2 · 5 · y · y
\The GCF is the product of the common prime factors in each monomial.
\GCF = 2 · y
\\
The greatest common factor of 2y and 10y2 is 2y.
\![\"\"](\"http://www.mathskey.com/userfiles/image/steps_images/solution.JPG\")
The greatest common factor of 2y and 10y2 is 2y.
\