The GCF is 3.
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The GCF is 9.
The GCF is 12.
The GCF is 9.
Oh honey, the Greatest Common Factor (GCF) for 42, 63, and 84 is 21. That's the largest number that divides evenly into all three of those numbers. So there you have it, simple as that!
The Greatest Common Factor (GCF) of 36, 54, and 63 is: 9