The GCF is 1.
The GCF is 1.
GCF of 21 and 42: 21GCF of 16 and 25: 1
The GCF is 5.
The GCF is of 21, 42, and 84 is 21.
You need at least two numbers to find a GCF. If that's 21 and 25, the GCF is 1.
The GCF is 1.
The GCF is 1.
1
The GCF is 1.
The GCF is 1.
The GCF is 25.
The GCF is 21.