How do you find the gcf of 2 numbers

You need to find what numbers can multiply to make that number. I hope this makes sense

To find the GCF of two numbers, list all the factors of those numbers, then underline all the matching factors, and finally find the grates common factor.

Example:

GCF (30, 25) = x

30: 1,2,3,5,6,10,15,30

25: 1,5,25

Common Factors: 1, 5

Greatest Common Factor: 5

x=5

GCF (30,25) = 5