CK-12 Foundation
Ck 12: Arithmetic: A Number as a Product of Its Prime Factors
[Free Registration/Login may be required to access all resource tools.] Write the prime factorization of given numbers.
Other
Help With Fractions: The Greatest Common Factor
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.
University of Vienna (Austria)
University of Vienna: Elementary Properties of Numbers
Quick interactive assessment which determines skill level on fraction equivalence, prime factorization, and common divisors/multiples.
Math Planet
Math Planet: Factorization and Prime Numbers
Gain an understanding of how to factor prime numbers by viewing examples and a video lesson.
Khan Academy
Khan Academy: Prime Factorization
A practice quiz on the prime factorization of numbers. Includes hints.
Other
Greatest Common Factor Calculator
Free online calculator provides help with finding the greatest common factor.
Cool Math
Coolmath: Pre Algebra: Prime Factorizations
In this tutorial, students learn how to do prime factorization by a few different methods, including factor trees and factor stacks. The exercises work their way up from 2-digit numbers up to 5 digits. Includes practice problems.
Calculator Soup
Calculator Soup: Greatest Common Factor Gcf Calculator
Calculate GCF, GCD, and HCF of a set of two or more numbers and see the work using factorization. An interactive calculator, explanations, and examples are included.
Homeschool Math
Homeschool Math: Prime Factorization
This site contains a free lesson on Prime Factorization in which students learn by doing practice problems.
Alabama Learning Exchange
Alex: My Favorite Number
The activity allows students to review many of the number theory concepts. Students will pick a composite number write verbal expressions about the number, find the factors, prime factorization, list multiples, draw a cartoon character...
Alabama Learning Exchange
Alex: Hanging Out With Prime Factorization
During this lesson, students will review factors, prime and composite numbers. Students will also create a mobile that show the prime factorization of the number of their choice. This lesson plan was created as a result of the Girls...
Math Aids
Math Aids: Fractions Worksheets
Great resource for learning and practicing fractions and their different operations. Math worksheets are printable, may be customized, and include answer keys.
Cuemath
Cuemath: Highest Common Factor
Explore the world of Highest Common Factor or Greatest Common Factor (GCF) by going through its various aspects and properties. Find answers to questions like what is the highest common factor for a group of numbers, easy ways to...
Cuemath
Cuemath: Factors
A factor of a number in math is a number that divides the given number. Factors are used in many situations in daily life. This article explains factors and how to find factors using multiplication and division. Included are solved...
Cuemath
Cuemath: Prime Factorization
In this lesson, you will be learning prime factorization to solve various mathematical problems followed by solved examples and practice questions.
Cuemath
Cuemath: Least Common Multiple
Learn about the properties of Least Common Multiples (LCM) and the three methods to find the LCM. Included are solved examples and interactive problems for review.
Quia
Ixl Learning: Least Common Multiple
Brush up on your math skills relating to the least common multiple then try some practice problems to test your understanding.
Quia
Ixl Learning: Prime Factorization
Brush up on your math skills relating to prime factorization then try some practice problems to test your understanding.
Cool Math
Coolmath: Pre Algebra Factorizations
Learn about "factorization" from Cool Math. Several examples and practice problems are provided.
SMART Technologies
Smart: Factors and Multiples
Students are introduced to prime numbers, composite numbers, prime factorization, greatest common factor, and least common multiple in this SMART whiteboard activity.
Doina Popovici
Math Play: Prime Factorization Game
Students can practice factorization in this online game.
Wyzant
Wyzant: Prime Factors Calculator
Students input a number to be factored and the WyzAnt calculator does the rest. Limitations include the fact that numbers which are negative or which contain primes bigger than 541 cannot be handled.
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.
Doina Popovici
Math Play: Prime Factorization Game
Students can practice prime factorization in this online game that can be played individually or in teams.