Answer
(This question asks you to write the answer in your own words.)
The GCF is the largest factor (divides a number evenly, with no remainders or left overs) that all the numbers in the list are divisible by.
Work Step by Step
The GCF is just the biggest number that all numbers in a list are divisible by. To find the GCF all you need to do is:
First, list all the factors.
Then, multiply the factors all the numbers have in common. That is the GCF.