To find a pair of numbers with a given GCF, take the GCF number and double it. The pair of numbers is the GCF, and two times the GCF.
For instance, two numbers with a GCF of 3 are 3 and 6.
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The GCF is a single number so there cannot be any pair of numbers in the answer.
10 and 120
8 and 16
The GCF is: 1.
A number can't have a factor greater than itself, so the GCF of a pair of numbers can't ever be greater than the smaller number. The GCF of 9 and 18 is 9.