There is no "Greatest Common Factor" when there is only one number. To have a "common" factor you need at least 2 numbers.
The greatest factor of 812 is 812. The greatest factor of any number is that number.
You need at least two numbers to find a GCF. If that's 8 and 12, the GCF is 4.
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The word "GREATEST" is a superlative adjective and that means there can be only one.GCF(912, 21) = 3.
The Greatest Common Factor (GCF) is: 8
The greatest common factor is 2
The greatest common factor of 30 and 39 is 3.
The greatest common factor (GCF) is: 5.