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Method 1:
\List the factors of each number.
\Factors of 20: 1 , 2 , 4 , 5 , 10 , 20
\Factors of 25: 1 , 5 , 25 \ \
\Identify the greatest common factor.
\The greatest common factor of 20 and 25 is 5.
\The GCF is 5.
\No,those numbers are not relatively prime.
\![\"\"](\"http://www.mathskey.com/userfiles/image/steps_images/step2.JPG\")
Method 2:
\Write the prime factorization of each number.
\20 = 2 × 2 × 5.
\\
25 = 5 × 5. \ \
\There is a common prime factors.
\The GCF is 5.
\No,those numbers are not relatively prime.
\ ![\"\"](\"http://www.mathskey.com/userfiles/image/steps_images/solution.JPG\")
No.
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