I'm guessing that you want to simplify the fraction 6/15. GCF of 6 & 15 is 3, so if you divide both numerator and denominator by 3, you get 2/5.
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The greatest common factor of 15 and 105 is 15.
Since 15 is a factor of 60, it is automatically the GCF.
The greatest common factor (GCF) is: 5.
Since 5 is a factor of 15, it is automatically the greatest common factor of the pair.
The greatest common factor of 135 and 300 is 15.