The GCF is 3.
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The greatest common factor (GCF) is 3.
The greatest common factor (GCF) is: 3
Find the factors of each number first. For 3 it is 1, 3 For 6 it is 1, 2, 3, 6 The greatest common factor of 3 and 6 is 3 since that is the highest factor they have in common.
The greatest common factor of 18 21 and 42 is 3.
1 is the greatest common factor of 8 and 27. It is also the least. It is also the only.