i use a GCF to simplify a fraction by dividing it into both the numerator and the denominator.
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The GCF is 1.
Gcf you use when you are finding the greatest factor for the numbers. Lcm you use when you are finding the smallest multiple in the numbers factors
The GCF of 10 and 15 is 5.
Whatever you use, you need at least two numbers to find a GCF.
The GCF is 6.