The GCF is 21.
The GCF is 42.
The GCF of 42 and 84 is 42.
The GCF is 7.7 is the GCF of 42, 49 and 84.
The GCF is 21.
The GCF is 7.
The GCF is 6.
The GCF is 6.
The GCF is 6.
The GCF is 7.
GCF of 42 and 112 and 105 is 7.
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!