Khan Academy
Khan Academy: Prime and Composite Numbers Intro
Discusses factors, prime and composite numbers, and why the number 1 is not prime or composite. Includes practice problems throughout, along with explanations of solutions.
Math Planet
Math Planet: Factorization and Prime Numbers
Gain an understanding of how to factor prime numbers by viewing examples and a video lesson.
Cuemath
Cuemath: Prime Factorization
In this lesson, you will be learning prime factorization to solve various mathematical problems followed by solved examples and practice questions.
Other
Help With Fractions: Prime Numbers Chart
Prime and composite numbers are defined on this website. A prime number chart is also included for all prime numbers under 10,000.
Cuemath
Cuemath: Highest Common Factor
Explore the world of Highest Common Factor or Greatest Common Factor (GCF) by going through its various aspects and properties. Find answers to questions like what is the highest common factor for a group of numbers, easy ways to...
Cool Math
Coolmath: Pre Algebra Prime and Composite Numbers
Students can learn the definitions of "prime numbers" and "composite numbers" with this resource. Several pages are provided that show students how to break down composite numbers until only prime numbers are left.
Cuemath
Cuemath: Prime Numbers
Learn about the history of prime numbers, properties of prime numbers, and easy methods to find prime numbers. Included are solved examples and interactive problems for review.
CK-12 Foundation
Ck 12: Elem Math: Identifying Prime or Composite Numbers
[Free Registration/Login may be required to access all resource tools.] For this learning module, students are asked to identify prime and composite numbers. Includes video demonstrating a sample problem [1:30] and a set of practice...
Khan Academy
Khan Academy: Identify Prime Numbers
Identify prime numbers less than 100. Students receive immediate feedback and have the opportunity to try questions repeatedly, watch a video or receive hints.
Quia
Ixl Learning: Prime Factorization
Brush up on your math skills relating to prime factorization then try some practice problems to test your understanding.
Cuemath
Cuemath: Factors
A factor of a number in math is a number that divides the given number. Factors are used in many situations in daily life. This article explains factors and how to find factors using multiplication and division. Included are solved...
Other
Greatest Common Factor Calculator
Free online calculator provides help with finding the greatest common factor.
Alabama Learning Exchange
Alex: Hanging Out With Prime Factorization
During this lesson, students will review factors, prime and composite numbers. Students will also create a mobile that show the prime factorization of the number of their choice. This lesson plan was created as a result of the Girls...
Mangahigh
Mangahigh: Number: Prime Numbers
Explore factors and multiples to determine prime numbers.
AAA Math
Aaa Math: Prime and Composite Numbers
This math tutorial offers an explanation of prime and composite numbers and lets students practice finding them.
Mangahigh
Mangahigh: Number: Factors and Multiples
List factor pairs to determine all factors and multiples of a number.
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...
Shmoop University
Shmoop: Basic Operations: Prime Factorization
Students learn about prime factorization. The resource consists of notes, step-by-step examples, and practice problems with solutions.
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.
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...
CK-12 Foundation
Ck 12: Arithmetic: Prime Factorization
[Free Registration/Login may be required to access all resource tools.] Write the prime factorization of given numbers.
Calculator Soup
Calculator Soup: Greatest Common Factor Gcf Calculator
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.
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.
Quia
Ixl Learning: Prime and Composite Numbers
Brush up on your math skills relating to prime and composite numbers then try some practice problems to test your understanding.