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Cool Math

Coolmath: Pre Algebra Factorizations

For Students 9th - 10th
Learn about "factorization" from Cool Math. Several examples and practice problems are provided.
Activity
Math Is Fun

Math Is Fun: All Factors of a Number

For Students 3rd - 8th Standards
Great tool that will find all factors of a number, not just the prime factors.
Activity
Math Medics

S.o.s. Math: Factoring Integers

For Students 9th - 10th
This S.O.S. tutorial gives students a basic review of factoring integers. Follow the tutorial to refresh your skills involving the rules for factoring numbers. Contains practice problems with links to the answers.
Activity
Other

Greatest Common Factor/definition and Example

For Students 9th - 10th
A walkthrough example of the discovery of the GCF of three numbers. Contains a definition as well.
Whiteboard
ClassFlow

Class Flow: Number Sense Related to Division

For Teachers 3rd - 5th Standards
[Free Registration/Login Required] This flipchart introduces divisibility, primes and composites, averages, and estimating quotients.
Handout
University of St. Andrews (UK)

University of St. Andrews: Marin Mersenne

For Students 9th - 10th
Even though his equation to determine all prime numbers did not succeed, it did help the investigation of large prime numbers.
Graphic
Curated OER

Clip Art by Phillip Martin: Prime and Composite Numbers

For Students 3rd - 8th
A clipart illustration by Phillip Martin titled "Prime and Composite Numbers."
Activity
National Institute of Educational Technologies and Teacher Training (Spain)

Ministerio De Educacion: La Criba De Eratostenes

For Teachers 3rd - 5th Standards
Reinforce your knowledge about prime and composite numbers. Geogebra plugin required.
Activity
Instituto Latinoamericano de la Comunicacion Educativa

Red Escolar: Brincos Y Numeros

For Students 3rd - 5th Standards
In Spanish. Find patterns with numbers less than 50. Also there is an activity to introduce the concept of multiplication.
Activity
Texas Instruments

Texas Instruments: It's Greek to Me

For Teachers 6th - 8th
Students learn Euclid's Method of finding the Greatest Common Factor of large numbers. They also review finding GCF using prime factorization and listing.
Unit Plan
Sophia Learning

Sophia: Simplifying Radical Expressions: Lesson 5

For Students 9th - 10th Standards
This lesson will provide examples simplifying radical expression by applying the properties of square roots and prime factorization. It is 5 of 8 in the series titled "Simplifying Radical Expressions."
Activity
Purple Math

Purplemath: Lcm & Gcf

For Students 9th - 10th Standards
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.
Unit Plan
PBS

Pbs Learning Media: Patterns of Factors

For Students 6th - 8th
Demonstrate your grasp of patterns and factors by sorting the numbers into the correct columns. This interactive table focuses on factor pairs and prime factors for the numbers 2 to 36.
Interactive
Calculator Soup

Calculator Soup: Greatest Common Factor Gcf Calculator

For Students 6th - 8th Standards
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.
Unit Plan
The Math League

The Math League: Fractions

For Students 9th - 10th
This tutorial covers all types of fractions with simple explanations on how to work with them.
Website
PBS

Pbs Learning Media: Pizza Toppings

For Students 6th - 8th Standards
This Cyberchase video features Bianca who uses Venn Diagrams to make a pizza that satisfies the topping preferences of her friends.
Handout
Paul Dawkins

Paul's Online Notes: Algebra: Preliminaries: Factoring Polynomials

For Students 9th - 10th
Detailed math tutorial features notes and examples that illustrate how to factor polynomials. It discusses factoring out the greatest common factor, factoring by grouping, factoring quadratics, and factoring polynomials with degree...
Handout
Wolfram Research

Wolfram Math World: Fermat's Theorem

For Students 9th - 10th
This site summarizes Fermot's Theorem, there are links to related topics on the page, some prior understanding of modulus is suggested.
Handout
Wolfram Research

Wolfram Math World: Euclid's Theorems

For Students 9th - 10th
This site from MathWorld.com provides a description of the theorems of Euclid and his theories of prime and composite numbers.
Activity
Varsity Tutors

Varsity Tutors: Hotmath: Practice Problems: Fractions, Number Theory

For Students 9th - 10th Standards
Twenty problems presented on the topics: factors, prime/composite and many aspects of working with fractions. They are given with each step to the solution cleverly revealed one at a time. You can work each step of the problem then click...
Activity
Other

Help With Fractions: The Greatest Common Factor

For Students 3rd - 8th Standards
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.
Handout
Other

Stat Soft: Statistics Glossary

For Students 9th - 10th
Dozens of statistical terms are defined and illustrated in this glossary.
Unit Plan
Mangahigh

Mangahigh: Number: Least Common Multiple and Greatest Common Factor

For Students 4th - 7th Standards
This site provides students practice with the concept of least common multiples and greatest common factors. Students can learn about the topic by completing an interactive tutorial. Students can then take a ten question timed test to...
Activity
University of Cambridge

University of Cambridge: Nrich: Funny Factorisation

For Students 6th - 9th
Learning exercise deals with factors and factorization.

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