2 is the greatest common factor
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The common factors between 8 and 18 are (of course 1) and 2.8 = 1 x 2 x 2 x 218 = 1 x 2 x 3 x 3The only common ones are 1 and 2. The greatest common factor is found by multiplying them together to get 2.
You need at least two numbers to find a GCF.
Close ! 9 is a factor of 378, but not of 379.
91,560
Its factors are: 1, 2, 109 and 218