Twenty-four problems present a variety of problems working with finding the greatest common factor and finding prime factorizations. They are given with each step to the solution cleverly revealed one at a time. You can work each step of...

Two different methods of finding the greatest common factor are explained at this one page website. It is very easy to follow the step by step directions.

Purplemath shows an easy and orderly way to determine the GCF and LCM of any two numbers. Even large numbers won't be a challenge with this method.

Practice using your graphing calculator for number theory problems, including prime factorization, greatest common factor, least common multiple, and scientific notation. If you get stumped or if you would like to check your work, then...

Students learn Euclid's Method of finding the Greatest Common Factor of large numbers. They also review finding GCF using prime factorization and listing.