The HCF is: 12
The greatest common factor (GCF) for twenty-one and seventy-two is three.
The Greatest Common Factor of 72, 98: 2
seventy
The GCF is 16.
It is 504.
The GCF is 3.
It is: 15
The GCF is 18.
No, it's six. 12 is not a factor of thirty.
There are no common or greatest common factor(s) of just one number. In order to find the common or greatest common factor(s) you need two or more numbers.
27
You need at least two numbers to find a GCF.