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Math Slice
Math Slice: Greatest Common Divisor (Factor)
This resource allows students to practice finding the greatest common factor among 2, 3, or 4 numbers. Students are able to select parameters of how many numbers they will compare, and the range of possible numbers. There are ten...
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.
Calculator Soup
Calculator Soup: Common Factors Calculator
This calculator factors a set of positive integers to find the common factors (common divisors) of those integers. Enter the set of numbers you want to factor separating them with commas.
Ducksters
Ducksters: Kids Math: Simplifying and Reducing Fractions
Understand the steps to do when simplifying and reducing fractions including finding the greatest common factor on this website.
Better Lesson
Better Lesson: Prepping for the Exam!
Practicing math problems is a great way to study for a math test!
Paul Dawkins
Paul's Online Notes: Factoring Polynomials: Practice Problems
Practice exercise reviews factoring polynomials including how to factor out the greatest common factor, factoring by grouping, factoring quadratics, and factoring polynomials with degree greater than 2.
Visual Fractions
Visual Fractions: Rename in Lowest Terms
Practice finding the lowest term name for a variety of different fractions using a number line.