Amby Duncan-Carr
Prime Factorization: Amby's Resources
What is prime factorization? This site goes through a step-by step process explaining different ways to find the prime factorization.
Calculator Soup
Calculator Soup: Prime Number Calculator
This prime number calculator will find if a number is prime or composite. If it is composite the calculator will also find all of the factors of the composite number.
Mocomi & Anibrain Digital Technologies
Mocomi: What Is a Prime Number?
Explains prime numbers and gives examples.
Other
Eratosthenes' Prime Number Sieve
Discover all the primes up to the number 400 by using this interactive table. Simply click on a number and its multiples disappear.
Scholastic
Scholastic: Study Jams! Math: Multiplication & Division: Prime Factorization
This site provides great practice on the concept of prime factorization. Students can first learn about the topic by watching a step by step instruction video that also points out areas of concern. Finally, students can practice their...
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.
Elias Saab
Math Drills: Prime Factorization Quiz
This site is an interactive quiz which provides students with a prime factorization problem. Students input their solution and have the program evaluate it. Hints are available if the student needs them, and explanations are provided...
Curated OER
Clip Art by Phillip Martin: Prime and Composite Numbers
A clipart illustration by Phillip Martin titled "Prime and Composite Numbers."
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.
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."
E-learning for Kids
E Learning for Kids: Math: Amazon River Boat Trip: Multiplication and Division
Explore prime and composite numbers, multiplication, and division with Julie throughout these interactive exercises.
National Institute of Educational Technologies and Teacher Training (Spain)
Ministerio De Educacion: Divisores Y Primos
Reinforce your knowledge on prime numbers and their divisors.
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!
ClassFlow
Class Flow: Number Sense Related to Division
[Free Registration/Login Required] This flipchart introduces divisibility, primes and composites, averages, and estimating quotients.
National Institute of Educational Technologies and Teacher Training (Spain)
Ministerio De Educacion: La Criba De Eratostenes
Reinforce your knowledge about prime and composite numbers. Geogebra plugin required.
Wolfram Research
Wolfram Math World: Euclid's Theorems
This site from MathWorld.com provides a description of the theorems of Euclid and his theories of prime and composite numbers.
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...
Math Open Reference
Math Open Reference: Number
Resource defines numbers into two main categories, counting numbers and scalars. It also gives examples of number notation.
Varsity Tutors
Varsity Tutors: Hotmath: Practice Problems: Fractions, Number Theory
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...
PBS
Pbs: Greatest Common Factor
In this video, learn how to find the greatest common factor of two numbers. Then, see how this can be used to solve problems with large numbers. In the accompanying classroom activity, students learn to find prime factors using factor...
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