# Greatest Common Factor

- The greatest common factor of two numbers is the largest number that divides into both numbers evenly, with no remainder. For example, the greatest common factor of 60 and 84 is 12.

- This is also known as the Greatest Common Divisor (gcd) and the greatest common divisor of
*a*and*b*is written as*(a,b)*.

- Note that
*(0,0)=0*

**See also: **Coprime, Relatively Prime, Unitary Divisor.

**Subjects: ** Mathematics