It is 18.
The GCF is: 9
The GCF of 10 and 54 is 2.
The GCF is 27.
The GCF is 6.
It is 18.
The GCF is: 9
It is: 18
It is: 18
The GCF/HCF of 56 and 180 is 4.
The GCF is 18.
The GCF is 18.
The GCF is 18.
The GCF is 18.
The GCF is 9.
The GCF is 18.
The GCF is 54.