You need at least two numbers to find a GCF.
The GCF is 4.
The HCF of 4 and 90 is 2.
The HCF of 4 and 5 is 1.
The GCF is 4.
The GCF is 4.
The GCF is 4.
The GCF is 4.
The GCF is 4.
The HCF is 4. 16/4 is 4, 12/4 is 3
The HCF is 1.
It is 1 but the HCF is 4
The HCF of 20 and 24 is 4.