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.
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The greatest common factor (GCF) is 3.
The greatest common factor (GCF) is: 3
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.
6 = 2 * 3. 9 = 3 * 3. So the greatest common factor is 3.