To get started using this method of finding the Greatest Common Factor of [n] and [m], we should first find and list all the factors of each number. You can see how this is done by looking at the “Factors of” articles that are linked to below.
Let’s take a look at the factors for each of these numbers, 150 and 1:
Factors of 150: 1, 2, 3, 5, 6, 10, 15, 25, 30, 50, 75, 150
Factors of 1: 1
When you compare the two lists of factors, you can see that the only common factor is 1. So, in this case, the GCF of 150 and 1 is 1.