Mangahigh
Mangahigh: Number: Least Common Multiple and Greatest Common Factor
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...
McGraw Hill
Glencoe: Self Check Quizzes 2 Prime Factorization
Use Glencoe's Math Course 2 randomly generated self-checking quiz to test your knowledge of prime factorization. Each question has a "Hint" link to help. Choose the correct answer for each problem. At the bottom of the page click the...
Other
Reuters: Boko Haram Kidnaps Wife of Cameroon's Vice Pm, Kills at Least Three
Read about the most recent terrorist acts by the group Boko Haram, including murder and the kidnapping of the wife of Cameroon's Vice Prime Minister. (Published July 27, 2014)
Quia
Quia: Divisibility and Prime
If you enjoy playing the game Battle Ship you will enjoy this game. When you locate an enemy ship to get the hit you must correctly answer a question using your knowledge of divisibility rules and prime numbers. It is a fun way to...
University of Cambridge
University of Cambridge: Nrich: Two Primes Make One Square
On this one page website sharpen your logic, prime numbers and square numbers skills while working on this challenge. The solution is available to double check your solution.
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.
E-learning for Kids
E Learning for Kids: Math: Inca Temple: Number Sense
Do you want to know how to pronounce really big numbers? Paul can teach you!
Other
The Prime Pages: Sierpinski Number
This site from the University of Tennessee provides a description of what the Sierpinski number is and what it does, as well as giving the formula and examples.
University of Cambridge
University of Cambridge: Nrich: A Conversation Piece
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.
Shodor Education Foundation
Shodor Interactivate: Factorize
This Shodor site gives a brief explanation of factorization, and it allows you "to find all of the factorizations of a given number and then draw the product as the area of a rectangle on a grid."
Ministry of Education and Universities of the Region of Murcia (Spain)
Ministerio De Educacion Y Ciencia: Numeros Primos
This interactive unit explain what prime numbers are and how to find them. It also discuss the Sieve of Eratosthenes and the Mersenne number.
Other
The Prime Glossary: Logarithmic Function
A glossary definition of a Logarithmic Function. Click on any of the terms in the article for more information about them.
Calculator Soup
Calculator Soup: Prime Factorization Calculator
Use this prime numbers calculator to find all prime factors of a given integer number up to 1 trillion. This calculator presents prime factors of a number, prime decomposition in exponential form, CSV (comma separated values) list of...
ClassFlow
Class Flow: Factoring, Prime and Composite
[Free Registration/Login Required] This flipchart defines factors, prime number, and composite numbers. It gives step-by-step instructions on how to list all the factors of a whole number and then identify the number as a prime number or...
Varsity Tutors
Varsity Tutors: Hotmath: Algebra Review: Prime Factorization
Find a quick, concise explanation of how to find the unique prime factorization of a number. An example is given and clearly explained.
University of Cambridge
University of Cambridge: Nrich: Tom's Number
Use the clues Tom gives you to figure out his number. The solution is right there on this one page website.
Texas Instruments
Texas Instruments: Factors Galore C: Prime Factorization
In this activity, students use the calculator to find the prime factorization of a number.
Math Is Fun
Math Is Fun: All Factors of a Number
Great tool that will find all factors of a number, not just the prime factors.
Mathigon
Mathigon: Math Foundations: Divisibility and Primes: Divisibility Rules
There are a few different rules that can make it easy to check if a number is divisible by another. In this lesson you will learn some of them such as,any number that ends in 0, 2, 4, 6, or 8 is divisible by 2, divisibility by 5 we...
Other
Mersenne Prime Search: Homepage
This site from Mersenne Prime Search is maintained by a group of mathematicians looking for the 5 largest prime numbers. An interesting site for students to watch mathematicians at work and explore the world of prime numbers.
University of Cambridge
University of Cambridge: Nrich: Penta Primes
Using only the single digits listed make as many prime numbers as you can for this challenge. After you have your list you can check this one page website and it will show you the solution.
Varsity Tutors
Varsity Tutors: Hotmath: Algebra Review: Composite Numbers
Find a quick, concise explanation of Composite Numbers. Several examples are given and clearly explained. Prime numbers are also described.
National Institute of Educational Technologies and Teacher Training (Spain)
Ministerio De Educacion: Primos Gemelos
A twin prime is a prime number that differs from another prime number by two. Learn about them with these exercises.
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