The GCF is 21.
The GCF is 1.The GCF of 14, 21 and 24 is 1.
The GCF is 21.
The GCF is 3.
The GCF is 1.
The GCF is 21.
The GCF is 1.
The GCF is 1.
The GCF is 3.
The greatest common factor of 21 and 63 is 21.Since 21 is a factor of 63, it is automatically the GCF.
The GCF is 21.
You need at least two numbers to find a GCF. The GCF of 21 and 42 is 21.