List them.
Example: 30 and 42
1,2,3,5,6,10,15,30
1,2,3,6,7,14,21,42
Select the common factors.1,2,3 and 6
You do a factor rainbow to find a prime factorization. You compare prime factorizations to find a greatest common factor.
The least common factor is always 1.
The least common factor of any set of integers is 1.
There is always a common factor. If there are no common prime factors, the GCF is 1.
Find out about factors and factor trees.
7
The greatest common factor (GCF) is 2.
The greatest common factor (GCF) is 4.
The Greatest Common Factor (GCF) is: 12
The greatest common factor (GCF) is 3.
The greatest common factor (GCF) is 5.
The only factor they have in common is 1. It has to be the greatest.