The GCF of 9 and 21 is 3.
The GCF is 3.
The GCF of 9 and 21 is 3.
The GCF is 3.
The GCF is 3. The LCM is 63.
The GCF of 21 and 9 is 3. 21 and 9 can only be divided by three.
The GCF is 3.
The GCF is 1.
The GCF is 3.
The GCF is 9.
The greatest common factor (GCF) of 21 and 9 is 3.
the answer is 3