What is the greatest common factor of 6, 12, and 25?

1 Answer
Feb 12, 2017

The GCF is 1.

Explanation:

First, we have to break down each number to its prime factors.

Let's take the number 6 first:

6=231

Although multiplying by 1 is not necessary, sometimes it helps visualize and understand (like in this case) that the GCF is 1.

Now 12:

12=621

12=3221

12=3221

Finally, 25:

25=551

25=521

The only factors that are written throughout our prime factorization are

1,2,3,5

However, not all of the numbers share all of the factors. The only (and the greatest) factor that all three numbers share is the number 1. So the answer is 1.