Because sometimes one is the only factor they have in common.
Yes.
No; two numbers can have only 1 GCF.
Yes, if they have no other common factors.
If one of the numbers is a multiple of the other, the smaller number is the GCF. If the two numbers are prime numbers, the GCF is 1. If the numbers are consecutive, the GCF is 1. If the numbers are consecutive even numbers, the GCF is 2.
When one of the numbers is a factor of the other.
You can only have one GCF and you need at least two numbers to find it.Two numbers with a GCF of 850 are 850 and 1700.
You need at least two numbers to find a GCF.
When one of the numbers is a factor of the other.
One
No. If both numbers are even, their GCF must be even itself.
Any positive number can be a GCF. But for each separate set of numbers, there can only be one.
It is one