The factors of 15 are: 1, 3, 5, 15
The factors of 28 are: 1, 2, 4, 7, 14, 28
The common factors are: 1
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The GCF is 1.
First you have to find the GCF (Greatest Common Factor) of 28 and 30, which is 2, so then you divide 2 by 28 and 30, and get 14 over 15. Hoped this helped!
Find out all the factors and then find the greatest common factor (gcf)...........very easy
The GCF is 2.
The GCF is 28.