Two or more numbers are required to find the greatest common factor between them.
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You need at least two numbers to find a GCF. If that's 16 and 66, the GCF is 2.
The GCF is 2.
You need at least two numbers to find a GCF. If that's 72 and 96, the GCF is 24.
The GCF of 10 and 15 is 5.
You need at least two numbers to find a GCF.