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: 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.
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.
National Council of Teachers of Mathematics
The Math Forum: Prime Numbers
Explains what Prime Numbers are and how to find them. Includes a list of primes under 200 and discusses the Sieve of Eratosthenes. This site has numerous links to other internet sources regarding prime numbers.
Mathigon
Mathigon: Math Foundations: Divisibility and Primes: Prime Numbers
This lesson focuses on prime numbers, numbers that can only be divided by one and itself. It explains the Fundamental Theorem of Arithmetic and the Sieve of Eratosthenes. Includes practice activities.
Mathigon
Mathigon: Math Foundations: Divisibility and Primes: The Distribution of Primes
This lesson focuses on the distribution of large prime numbers. It offers a calculator to check numbers for prime and a calculator that allows you to create prime numbers. It also provides the history of methods find the distribution of...
ABCya
Ab Cya: Prime Numbers
Number Ninja: Prime Numbers is a fast-action way to practice factors. Act quickly and use your finger or mouse to slice numbers and reduce them to their prime factors. Do not slice a prime number!
University of St. Andrews (UK)
University of St. Andrews: Prime Numbers
Learn the history and mathematicians behind the study of prime numbers.
Texas Instruments
Texas Instruments: Prime Numbers Time Line
A number line showing prime numbers less than 100.
University of Utah
University of Utah: Prime Numbers
A discussion of Eratosthenes' development of the system of prime numbers. Includes a Java program that demonstrates the sieve.
Scholastic
Scholastic: Study Jams! Math: Multiplication & Division: Prime Numbers
This site provides great practice on the concept of prime and composite numbers. 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...
Varsity Tutors
Varsity Tutors: Hotmath: Algebra Review: The Prime Page
Find a quick, concise but complete explanation of prime numbers. A variety of related topics are covered such as: A table of the first 400 Prime Numbers, Do Primes ever stop?, the Prime Number Theorem and Twin Primes.
Math Planet
Math Planet: Factorization and Prime Numbers
Gain an understanding of how to factor prime numbers by viewing examples and a video lesson.
Mangahigh
Mangahigh: Number: Prime Numbers
Explore factors and multiples to determine prime numbers.
Cool Math
Coolmath: Coolmath4kids: Math Ficher Prime Numbers
Hop into your boat and go fishing for the prime numbers between 1 and 100!
Wolfram Research
Wolfram Math World: Prime Number
Prime Numbers are defined with a glossary hyperlink to terms used in the definition. Lots of information and examples included. Lists many math-related links. Scroll down to the bottom of the page to see how prime numbers are used in the...
Calculator Soup
Calculator Soup: 1000 Prime Numbers
The prime numbers table lists the first 1000 prime numbers from 2 to 8011. There are 1,009 total prime numbers in the lookup table.
National Council of Teachers of Mathematics
The Math Forum: How Do You Find Prime Numbers?
This site explains prime number theory and how to find prime numbers.
Ducksters
Ducksters: Kids Math: Prime Numbers
Math prime numbers for kids to learn about these unique digits.
Alabama Learning Exchange
Alex: Exploring Prime Numbers
Exploring Prime Numbers is a hands-on, minds-on math lesson that engages students in the discovery of prime numbers through the construction of multiplication arrays. Students then extend on their background knowledge of multiples and...
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.
Other
University of Tennessee: The Prime Pages
Here you can find a detailed searchable database of the 5000 largest known primes! Content also includes a glossary, a top 10 records list, prime-music, programs, free downloads, and much more!
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.
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