How do you find the greatest common factor of 9, 21?

1 Answer
sjc
Nov 4, 2016

GCF(9,21)=3GCF(9,21)=3

Explanation:

factors 9:--{1,3,9}{1,3,9}

factors 21:--{1,3,7,21}{1,3,7,21}

common factors:---{1,3,9}nn{1,3,7,21}{1,3,9}∩{1,3,7,21}

={1,3}={1,3}

GCF(9,21)=3GCF(9,21)=3

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