![\"\"](\"http://www.mathskey.com/userfiles/image/steps_images/step1.JPG\")
If the greatest common factor of two or more numbers is 1, then they are
\relatively prime.
\Greatest common factor (GCF) is a number that is greatest among the
\common factors of the numbers.![\"\"](\"http://www.mathskey.com/userfiles/image/steps_images/step2.JPG\")
List the factors of each number.
\Factors of 7 : 1, 7
\Factors of 28 : 1, 2, 4, 7, 14
\Identify the greatest common factor.
\The greatest common factor of 7 and 28 is 7.
\Since the GCF is not 1, 7 and 28 are not relatively prime.![\"\"](\"http://www.mathskey.com/userfiles/image/steps_images/solution.JPG\")
The greatest common factor of 7 and 28 is 7.
\7 and 28 are not relatively prime.