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No matter what you use, you still need at least two numbers to find a GCF.
2 |10,18 , |_________ 5,9 The GCF of 10 and 18 is 2.
2 |10,18 , |_________ 5,9 The GCF of 10 and 18 is 2.
An interesting trick is to subtract the two numbers, as follows: For example, the GCF of 14 and 10 is the same as the GCF of 10 and 4, where 4 is the result of the subtraction. Instead of subtracting several times, you can also get the remainder of a division: 10 divided by 4 gives a remainder of 2.
The GCF is 2.