You need at least two numbers to find a GCF. If that's 12, 18 and 30, the GCF is 6.
The GCF is 6.
The GCF is 9.
The GCF is 4.
The GCF is 30.
50
The GCF is 1.
The GCF is 27.
The GCF is: 1
The GCF is 5.
The GCF is 2.
The GCF is 3.
The GCF of 125, 200 is 25.