It is: 1
The GCF is 99.
The GCF is 9.
The GCF is 1.
The GCF is 11.
The GCF is 9.
The GCF is 11.
The greatest common factor of 80 , 900 = 20
The GCF is 80.
The GCF of 99 and 126 is 9.
The GCF is 4.
The GCF is 8.
The greatest common factor of 99 and 135 is 9.