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.
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.
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.
Wyzant
Wyzant: Prime Number List
WyzAnt provides a list of the prime numbers. The user decides how many primes to see and in what fashion--horizontally or vertically and in how many rows.
Math Is Fun
Math Is Fun: Prime Factorization
Find a definition or prime numbers and prime factorization, as well as examples on how to find the prime factors of 12 and 147. Also, follow a link to a Prime Factorization Tool.
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.
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.
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.
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.
CK-12 Foundation
Ck 12: Arithmetic: A Number as a Product of Its Prime Factors
[Free Registration/Login may be required to access all resource tools.] Write the prime factorization of given numbers.
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.
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.
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.
Texas Instruments
Texas Instruments: Numb3 Rs: Prime Time
Based off of the hit television show NUMB3RS, this lesson helps students understand the Goldbach Conjecture (any even number greater than four can be written as the sum of two odd prime integers). Students explore how many pairs of odd...
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...
Mangahigh
Mangahigh: Number: Prime Factoring
Explore prime factors and what the missing exponent could be.
University of St. Andrews (UK)
University of St. Andrews: Prime Numbers
Learn the history and mathematicians behind the study of prime numbers.
Alabama Learning Exchange
Alex: Hanging Out With Prime Factorization
During this instructional activity, 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...
Texas Instruments
Texas Instruments: Prime Numbers Time Line
A number line showing prime numbers less than 100.
Mangahigh
Mangahigh: Number: Prime Numbers
Explore factors and multiples to determine prime numbers.
Mangahigh
Mangahigh: Number: Find Prime Factors
Test your knowledge of prime factors of two-digit 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...
Varsity Tutors
Varsity Tutors: Hotmath: Graphing Calculator Practice Problems Number Theory
Practice using your graphing calculator for number theory problems, including prime factorization, greatest common factor, least common multiple, and scientific notation. If you get stumped or if you would like to check your work, then...
Mangahigh
Mangahigh: Number: Factors and Multiples
List factor pairs to determine all factors and multiples of a number.
Other popular searches
- Prime Numbers
- Prime Factorization
- Prime and Composite Numbers
- Prime Numbers 100's Chart
- Prime Numbers Chart
- Prime Factorization Tree
- Prime Number Worksheets
- Composite Prime Numbers
- Math Prime Numbers
- Prime Numbers & Composites
- Listing All Prime Numbers
- Introducing Prime Numbers