If that's 28, 56 and 84, the GCF is 28.
If that's 2856 and 84, the GCF is 84.
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The GCF is 28.
The GCF is 42.
The GCF is 12.
The same as the GCF of 84 and 12 - where 12 is the remainder, when you divide 96 by 84.
The GCF of 28, 84, and 91 is 7.