Math is all about getting the most precise answer. You could reduce the fraction 8/12 to 4/6 but if you know that the GCF of 8 and 12 is 4, you can take 4 out of both of those and get 2/3, the simplest form. This makes a larger difference as numbers get larger.
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The greatest common factor is used to reduce fractions.
The Greatest Common Factor (GCF) is: 8
The greatest common factor is 2
The greatest common factor of 30 and 39 is 3.
The greatest common factor (GCF) is: 5.