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

1 Answer
EZ as pi
Dec 3, 2016

GCF = 2xx17=34GCF=2×17=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 34=2× 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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