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You need at least two numbers to find a GCF. If that's 2 and 8, the GCF is 2.
The answer is 4.
what is the greastest common factor of 32
The GCF is 4.
Since 28 is a factor of 84, it is automatically the GCF.
3
1
6
14
7 
7
3 is.
5