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 9 and 13 is 1
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The highest common factor of 7 and 13 is 1.
7 and 13 are both prime numbers, and so, by definition, are relatively prime.
Because of this, they have no common prime factors, and so the product of their common prime factors is 1.
The Greatest Common Factor (GCF) of 5 and 13 is 1. Since both 5 and 13 are prime, their only common factor can be 1.
The GCF is 1.
Three
The greatest common factor of 91 and 126 is 7.
The GCF is 3.
27 and 18
The greatest common factor (GCF) refers to a factor that is COMMON to two or more numbers. The question appears to be concerned with only one number.!