There can only be one "greatest" of anything.
The greatest common factor of these 3 numbers is 6.
The Greatest Common Factor of 18, 27, and 30 is 3.
The Greatest Common Factor of 18, 24, 30: 6
The greatest common factor of the numbers 18, 30 and 72 is 6.
The GCF is 3.
The greatest common factor is 6.
The GCF is: 6
The GCF is 6.
It is: 1
6 is.
The GCF is 6.
The GCF is 6.
The GCF is 6.