GCF and LCM of two or more numbers

Greatest Common Factor and Least Common Multiple of two or more numbers.

Find the GCF and the LCM of a set of numbers with this calculator which also shows the steps. The Greatest Common Factor (GCF) is the greatest factor that is common to two or more numbers (they share it); the Least Common Multiple (LCM) of two (or more) numbers is the smallest number (excluding zero) that is a multiple of both of the numbers.

It is also intended to be a teaching tool.