The GCF is 3.
The GCF of 21, 30, and 72 is 3.
The GCF is 3.
The GCF is 72.
The GCF is 8.
The GCF is 72.
9 is the GCF of 189 and 72. This leaves us with 21 and 8 as the resulting numbers through division. This cannot be broken down further with other common factors.
The GCF is 8.
The GCF is 8.
The GCF is 9.
The GCF is 2.
The GCF is 1.
The GCF is 4.