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

##### 1 Answer

Dec 3, 2016

#### Answer:

#### Explanation:

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

{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.