Question

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

Answer 1

`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.