National Council of Teachers of Mathematics
The Math Forum: Learning to Factor
Math Forum Faq which briefly defines greatest common factor and links to an in-depth investigation of how the GCF is found.
National Council of Teachers of Mathematics
The Math Forum: Finding the Greatest Common Factor of Two Numbers
Math Forum response to question about finding the greatest common factor by using the factoring tree method.
National Council of Teachers of Mathematics
The Math Forum: Ask Dr. Math: Formula for Greatest Common Divisor.
This site is a question and response to a student asking Dr. Math about the greatest common divisor, he gives an interesting way to find the gcd, as well as the button on calculators which commonly does the math for you.
National Council of Teachers of Mathematics
The Math Forum: Ask Dr. Math: Greatest Common Factors, Least Common Multiples
Math Forum response to request for info on how to find greatest common factors, and how this compares to least common multiples. Explanation includes examples of each.
Other
Locating the Greatest Common Factor
This site provides a detailed example of how to locate the greatest common factor. Is useful for students who need additional help in learning to find the greatest common factor.
Other
Greatest Common Factor/definition and Example
A walkthrough example of the discovery of the GCF of three numbers. Contains a definition as well.
Other
Greatest Common Factor/example
An example (with full explanation) where a Greatest Common Factor is found.
Free Math Help
Free Math Help: Greatest Common Factor
The lesson investigates the greatest common factor. Explanations and sample exercises are provided.
Wyzant
Wyzant: Finding a Gcf
In this lesson from WyzAnt, students learn how to find the greatest common factor (GCF) for numbers and expressions. There are practice problems and a GCF calculator for assistance.
Wyzant
Wyzant: Factoring a Gcf From an Expression
This tutorial demonstrates how to factor the GCF out of a polynomial expression. An online worksheet is provided for extra practice.
Wyzant
Wyzant: Factoring a Gcf From an Expression
Students review factoring a greatest common factor from an expression. The handout consists of an example and answer sheet.
ClassFlow
Class Flow: Greatest Common Factor
[Free Registration/Login Required] This flipchart assists in the instruction of finding the Greatest Common Factor. Two methods for identifying GCF are used.
ClassFlow
Class Flow: Reducing or Simplifying Fractions
[Free Registration/Login Required] This flipchart introduces how to simplify or reduce a fraction to the lowest terms. Prerequisites include: multiplying fractions, factoring, introduction to the concept of the Greatest Common Factor.
Interactive Mathematics
Interactive Mathematics: Factoring and Fractions
Polynomials are the focus of these lessons, concentrating on factoring and special products to work with rational expressions. Interactive tools of Live Math and Scientific Notebook are used to provide animated solutions to the examples....
Purple Math
Purplemath: Simple Factoring
Demonstrates how to factor simple polynomial expressions such as "2x + 6".
Interactive Mathematics
Interactive Mathematics: Common Factor & Difference of Squares
These easy to follow examples demonstrate how to factor algebraic expression using GCF and difference of squares.
Quia
Ixl Learning: Greatest Common Factor
Brush up on your math skills relating to the greatest common factor then try some practice problems to test your understanding.
Curated OER
36 = 2 * 2 * 3 * 3
This site provides the basics on finding the greatest common factor, along with directed practice.
Curated OER
36 = 2 * 2 * 3 * 3
A complete lesson on Greatest Common Factors, including methods of finding, examples, and a practice multiple-choice quiz.