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Factoring and number theory games and resources online

Factoring

Arrays and factors
Drag rectangles to show the factorizations of a given number.
wwwshodor.org/interactivate/activities/factors2/index.html.

Factor Game
A fun, interactive game where you practice divisibility among numbers 1-100. You can play against the computer or against a friend.
illuminations.nctm.org/ActivityDetail.aspx?ID=12

Factors and Remainders
An interactive animation demonstrating factors and remainders. Choose a number and its possibe divisor. The animation shows boxes (as given by the number) arranged into rows of (possible divisor), and you can SEE if there is any remainder.
www.absorblearning.com/media/item.action?quick=ml

MathGoodies Interactive Factor Tree Game
Type in a missing number to the factor tree, and the program will find the other factor, and continue drawing the tree as needed.
www.mathgoodies.com/factors/prime_factors.html

Snake
Eat factors, multiples, and prime numbers in this remake of the classic game.
www.pompuzzle.com/Snake

Math Mammoth Multiplication & Division 3 A self-teaching worktext for 5th grade that covers multi-digit multiplication, long division, problem solving, simple equations, ratios, divisibility, and factoring. Available as an affordable download ($4.50), and also as a printed copy. => Learn more and see the free samples! See more topical Math Mammoth books

Product game
For two players; each selects a factor, computer colors the product - who gets four in row wins.
illuminations.nctm.org/ActivityDetail.aspx?ID=29

Primes, Factors and Divisibility—Explorer at CountOn.org
Lessons explaining divisibility tests, primes, and factors.
www.counton.org/explorer/primes

So-Soo-Yoo®
A fun board game that helps children practice factors, factoring, and multiplication at the same time. Price $34.
teruen.com

Unique Prime Factorization
A video explaining the fundamental theorem of arithmetic: that each composite number has a unique prime factorization.
http://www.youtube.com/user/ArtOfTheProblem?#p/u/2/5kl28hmhin0

Prime Number Calculator
This calculator tests if a number is a prime, and tells you its smallest divisor if it is not prime.
www.basic-mathematics.com/prime-number-calculator.html

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