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The GCF is 3.
You need at least two numbers to find a GCF.
The GCF of 27 and 189 is 27.
The GCF is 4.
The GCF is 12.
9
The GCF is 21.
The GCF is 27.
The GCF is 63.
The GCF is 9.
The GCF is 1.
The GCF is 6.
The GCF is 14.