The GCF of 21 and 84 is 21. Since 21 is a factor of 84, it is automatically the GCF.
It is: 21
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The Greatest Common Factor (GCF) is: 4
The greatest common factor of the numbers 144 and 84 is 12.
6
The GCF of 84, 126 and 294 is 42.
The GCF is 2.