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...
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!
McGraw Hill
Glencoe: Self Check Quizzes 1 Prime Factors
Use Glencoe's randomly generated self-checking quiz to test your knowledge of prime factors. Each question has a "Hint" link to help. Choose the correct answer for each problem. At the bottom of the page click the "Check It" button and...
Varsity Tutors
Varsity Tutors: Hotmath: Algebra Review: Divisibility Tests
Find a quick, concise explanation of how to use the rules for divisibility by the numbers 2 through 10. Examples are given and clearly explained for each of the divisibility rules.
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 Playground
Math Playground: Multiplication Blocks
An additctive multiplication fact block game.
Cuemath
Cuemath: Odd Numbers
A comprehensive guide for learning all about odd numbers with definitions, properties, types, solved examples, and practice questions.
Other
Sieve of Eratosthenes
Named after the Greek Mathematician. This classic method of finding prime numbers is also great for teaching about factors and multiples. The visnos sieve allows for multi colored squares this allows identification of any numbers prime...
AAA Math
Aaa Math: Least Common Multiple
This tutorial offers an explanation of least common multiples, practice finding them and a game to play. There is a lot of information available at this location.
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."
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.
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.
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...
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.
Other
Gcd Training
Use this interactive table to practice finding the greatest common factor of two given numbers. The table can be reset with a new set of numbers for extra practice.
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...
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...
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...
Mangahigh
Mangahigh: Number: Putting Whole Numbers in Order Up to 100
Determine the which integer is larger.
Mangahigh
Mangahigh: Sigma Prime: Prime Factorization With Multiplication and Division
Practice your multiplication and division skills with prime numbers and prime factorization as you battle alien invaders.
CK-12 Foundation
Ck 12: Elem Math: Filling in the Largest or Smallest Divisor
[Free Registration/Login may be required to access all resource tools.] In this learning module, students must find either the smallest or largest integer divisor of a number that gives an answer that is less than another number....
CK-12 Foundation
Ck 12: Elem Math: Forming the Largest or Smallest Possible Number (Even and Odd)
[Free Registration/Login may be required to access all resource tools.] For this learning module, students are given a set of up to seven digits and must use their understanding of place value to make the largest or smallest possible...
CK-12 Foundation
Ck 12: Elem Math: Greatest and Least Values of Given Digits to 100,000 (Grade 3)
[Free Registration/Login may be required to access all resource tools.] This learning module features two videos and a set of practice questions on forming the largest and smallest number given a set of numbers.
Soft Schools
Soft Schools: Factors Worksheet
Generate a worksheet where students find all the factors of a number. When you create the worksheet, set the minimum and maximum number and the total number of problems. An answer key is optional.