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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.
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Handout
Quia

Ixl Learning: Prime and Composite Numbers

For Students 3rd - 5th Standards
Brush up on your math skills relating to prime and composite numbers then try some practice problems to test your understanding.
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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.
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Graphic
University of Utah

University of Utah: The Sieve of Eratosthenes

For Students 9th - 10th
Site gives an explanation of the Sieve of Eratosthenes, a table for prime numbers.
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eBook
Math Planet

Math Planet: Monomials and Adding or Subtracting Polynomials

For Students 6th - 8th
Gain an understanding of how to add or subtract polynomials by viewing an example and a video lesson.
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Lesson Plan
Better Lesson

Better Lesson: Prime Factorization of Numbers

For Teachers 6th
Sixth graders will climb math trees.
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Unknown Type
University of Vienna (Austria)

University of Vienna: Elementary Properties of Numbers

For Students 9th - 10th Standards
Quick interactive assessment which determines skill level on fraction equivalence, prime factorization, and common divisors/multiples.
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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.
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Unknown Type
Math Aids

Math Aids: Fractions Worksheets

For Teachers K - 1st Standards
Great resource for learning and practicing fractions and their different operations. Math worksheets are printable, may be customized, and include answer keys.
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Activity
University of Cambridge

University of Cambridge: Nrich: A Conversation Piece

For Students 3rd - 8th Standards
On this one page website sharpen your logic, division and prime number recognition skills while working on this challenge. The solution is available to double check your solution.
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Website
Shmoop University

Shmoop: Basic Operations: Prime Factorization

For Students 3rd - 8th Standards
Students learn about prime factorization. The resource consists of notes, step-by-step examples, and practice problems with solutions.
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Whiteboard
SMART Technologies

Smart: Factors and Multiples

For Teachers 3rd - 6th Standards
Students are introduced to prime numbers, composite numbers, prime factorization, greatest common factor, and least common multiple in this SMART whiteboard activity.
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Whiteboard
ClassFlow

Class Flow: Crct Review Day 4

For Teachers 3rd - 5th
[Free Registration/Login Required] This review for the Georgia CRCT covers factoring, prime numbers, graphing on coordinate plane.
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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...
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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.
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Interactive
AAA Math

Aaa Math: Least Common Multiple

For Students 3rd - 8th Standards
This tutorial offers an explanation of least common multiples, practice finding them and a game to play. There is a lot of information available at this location.
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Graphic
Other

Project Happy Child: 100s Board Worksheets

For Students Pre-K - 1st Standards
Use these 100s Boards to have students check for divisibility by 2-12 and for square and prime numbers. Just find the links below the 100s board that has the directions printed right on top of the worksheet.
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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.
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Interactive
Doina Popovici

Math Play: Prime Factorization Game

For Students 4th - 6th Standards
Students can practice factorization in this online game.
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Interactive
Doina Popovici

Math Play: Prime Factorization Game

For Students 5th - 7th
Students can practice prime factorization in this online game that can be played individually or in teams.
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Unknown Type
Math Aids

Math Aids: Factors Worksheets

For Students K - 1st
Great resource for learning and practicing fractions and their different operations. Math worksheets are printable, may be customized, and include answer keys.
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Activity
University of Cambridge

University of Cambridge: Nrich: Dominoes

For Students Pre-K - 1st
A set of online dominoes shows you how to work out multiplication problems.
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Lesson Plan
Alabama Learning Exchange

Alex: My Favorite Number

For Teachers 4th - 7th
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...
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Activity
Wolfram Research

Wolfram Math World: Pascal's Triangle

For Students 9th - 10th
This site from MathWorld provides great information on Pascal's Triangle. Links are provided throughout for additional information, along with several helpful charts and formulas. This is a good site to check out on the subject.