The greatest common factor (GCF) of 18 and 4 is 2.
18 = 2 x 3 x 3
4 = 2 x 2
There is no number larger than 2 which can evenly divide both 18 and 4.
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The GCF is 2.
The GCF of 4 and 18 is 2.
Using the GCF between 4 and 72 (which is 4) you can simplify the fraction to 1/18
The GCF is 18.
The GCF is 9.