How do you find the greatest common factor of 68, 34?

1 Answer
EZ as pi
Dec 3, 2016

#GCF = 2xx17=34#

Explanation:

Write each number as the product of its prime factors then you can see what you are working with:

#" "34 = 2 xx " "17#
#" "ul(68 =2xx2xx17)#
#GCF = " "2 " "xx 17 = 34#

{notice that the GCF is the product of all the common factors.]

You could have known this immediately if you realise
that 34 is half of 68.

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