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Method 1:
\List the factors of each number.
\Factors of 27: 1 , 3 , 9 , 27
\Factors of 18: 1 , 2 , 3 , 6 , 9 , 18 \ \
\Identify the greatest common factor.
\The greatest common factor of 27 and 18 is 9.
\The GCF is 9.
\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.
\27 = 3 × 3 × 3.
\\
18 = 2 × 3 × 3. \ \
\There is a common prime factors.
\The GCF is 9.
\No,those numbers are not relatively prime.
\ ![\"\"](\"http://www.mathskey.com/userfiles/image/steps_images/solution.JPG\")
No.
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