Greatest Common Factor (GCF) is the greatest Factor that divides two numbers.
For example, find the GCF of 14 and 8.
Factors of 14:1,2,7,14
Factors of 8:1,2,4,8
The Greatest Common Factor (GCF) of 14 and 8 is 2.
I hope you have a better understanding of what Greatest Common Factor (GCF) is.