You need at least two numbers to find a GCF.
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 162 and 243 is 81
The Greatest Common Divisor is 4
The Greatest Common Divisor is 28
The Greatest Common Divisor is 4
The Greatest Common Divisor is 35
The Greatest Common Divisor is 1
The Greatest Common Divisor is 2
The Greatest Common Divisor is 22
The Greatest Common Divisor is 9
The Greatest Common Divisor is 19
The Greatest Common Divisor is 10
The Greatest Common Divisor is 13