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