30
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The greatest common factor of 30 and 39 is 3.
The greatest common factor of 30 , 50 = 10
The greatest common factor (GCF) is often also called the greatest common divisor (GCD) or highest common factor (HCF). Keep in mind that these different terms all refer to the same thing: the largest integer which evenly divides two or more numbers.The greatest common factor of 300 and 990 is 30
The greatest common factor of 16 and 30 is 2
greatest common factor of 110 and 30 is 10.