# GCF and LCM

A **common factor** is a whole number that is a factor of two or more nonzero whole numbers. The greatest of the common factors is the greatest common factor (GCF).

**Relatively Prime:** Two or more numbers are relatively prime if their greatest common factor is 1.

**Monomials and the GCF:** You can find the greatest common factor of two or more monomials by factoring each monomial.

A multiple of a whole number is the product of the number and any nonzero whole number. A multiple that is shared by two or more numbers is a common multiple.

Find out more about GCF and LCM by reading the explanation below.

**Practice: ** Answer the following exercises about GCF and LCM.