9 and 18, among others.
You must have at least two numbers from which to derive a common divisor!
You need at least two numbers to find a GCF.
The greatest common divisor (GCD) refers to a divisor that is COMMON to two or more numbers. You have only one number in the question! The greatest divisor of any number is itself.
The two numbers are coprime, so they have no common divisor other than 1. So 1 is the greatest common divisor.
The largest of the common factors of numbers is known as the greatest common divisor or greatest common denominator. The smallest common factor is called the lowest common divisor.
You need at least two numbers to find a GCF. If that's 2 and 4, the GCF is 2.
You need at least two numbers to find a GCF.
There is none. A greatest common divisor is the largest number that will divide into two or more given numbers without a fractional remainder.
24
You need at least two numbers to find a GCF.
30 and 45
You need at least two numbers to find something in common.