3 is the GCF of 75 and 99. This leaves you with 25 and 33 respectively. Aside from 1, there are no further factors in common.
The GCF of 75 and 99 is 3.
The GCF is 99.
The GCF is 75.
If you mean 300 and 450 then the GCF is 150
The GCF is 9.
The GCF is 1.
The GCF is 11.
The GCF is 9.
The GCF is 11.
The GCF is 75.
The GCF of 99 and 126 is 9.
The GCF is 75.