You need at least two numbers to find a GCF.
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"Common" means "same for both". There's nothing common about a single number.
You need at least two numbers in order to start looking for common features.
The greatest common factor (GCF) is 8.
The Greatest Common Factor of 8, 10, 15: 1
The greatest common factor of 8 and 23 is 1.
The greatest common factor (GCF) is 2.
The greatest common factor of 632 and 1,000 is 8.