The GCF is 3.
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The GCF of 18, 27, and 78 is 3.18=2*3*327=3*3*378=2*3*13GCF=3
The GCF is 9.
The Greatest Common Factor of 9, 36, 72: 9
The greatest common factor of 99 and 135 is 9.
You need at least two numbers to find a GCF.