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The GCF is: 3
The GCF is 3.
The GCF is 7.
The GCF is 1.
The GCF is 147.
Since 21 is a factor of 147, it is automatically the GCF.
The GCF is 36.
The GCF is 12.
The GCF is 54.
The GCF is 27.
The GCF is 4.
The GCF is 6.
The GCF is 108.