7
There is no Greatest Common Factor (GCF) for a single number. The Greatest Common Factor (GCF) is the largest factor common to two or more given numbers.
The Greatest Common Factor (GCF) is: 12
Any pair of prime numbers
A single number does not have a common factor. Common factors are factors that two or more numbers have in common. The greatest common factor of a pair of numbers over 50 could be any number, depending on the pair of numbers. The greatest common factor of 51 and 100 is 1. The greatest common factor of 51, 52, 53, 54, 55, and 56 is 1. The greatest common factor of 52 and 100 is 2. The greatest common factor of 57 and 102 is 3.
1
15 and 30
15 and 30 is just one pair of number that has a greatest common factor of 15
Since 5 is a factor of 15, it is automatically the greatest common factor of the pair.
The factor pairs of 8 are 1,8 and 2,4
That happens when one of the numbers is a factor of the other.
A prime number