The GCF is 6.
The GCF is 6.
The GCF is 6.
The GCF is 6.
The GCF is 6.
The GCF is 6.
The GCF of 6 18 and 4 is 2. This leaves you with 3, 9 and 2 respectively. There are no more factors in common aside from 1.
The GCF is 6.
The GCF is 6.
The GCF is 1.
The GCF is 6.
The GCF is 6.