147 = 3 x 7 x 7, 189 = 3 x 3 x 3 x 7 so GCF = 3 x 7 = 21
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GCF(147, 189) = 21.
The GCF is 21.
You need at least two numbers to find a GCF.
The GCF is 27.
The GCF is 63.
The GCF is 9.
The GCF is 27.
The GCF is 3.
The GCF is 7.
The GCF is 1.
The GCF is 147.
The GCF is 27.