1 and 7
When you are finding common factors, one method is to list the factors.
In any list of distinct numbers, one will be greater than the others. In the list of common factors, one will be the greatest.
The product of all the common prime factors is the GCF. The product of all common factors would vary according to the list.
in sentences
the greatest common factors of what? The question makes no sense as it stands.
The common factors are: 1, 2, 4.
The common factors are: 1, 2, 5, 10.
The common factors of 28 and 54 are: 1, 2
5
List them.
The common factors are: 1, 2, 4, 7, 14, 28
The common factors are: 1, 2, 4, 8, 16.