Prime+Time

[|Prime Time Parent Letter] from //Connected Mathematics// by the Pearson Hall Publishing Company [|Parent Letter in Spanish]

Prime v. Composite

 * [|Ask Doctor Math]: Prime Numbers--What is a prime number? What is the Sieve of Eratosthenes?
 * [|Murderous Maths: Prime Numbers]--A trick to find prime numbers and a puzzle.
 * [|Learning Math Lesson: Finding Prime Numbers]
 * [|Algebra Online: Prime and Composite Numbers]--Definitions, some exercises, and description of how to find prime factorization

Factor v. Multiple

 * [|Learning Math Lesson: Models for Multiples and Factors]
 * [|Math.com Lesson on Factors and Multiples] with examples and online exercises
 * [|AAA Math Online Exercises in Finding Factors]
 * [|The Factor Game]: A strategy game requiring knowledge of the factors of numbers

Prime Factorization

 * "[|Prime Factorization]"--Information about how to find the prime factorization of a number and exercises
 * [|Prime Factorization]--Information about how to find the prime factorization of a number and applet to find prime factorization of very large numbers

Finding and Using the Greatest Common Factor and Least Common Multiple

 * [|Math.com Lesson on Greatest Common Factor]
 * [|Math.com Lesson on Least Common Multiple]
 * [|Investigating LCM and GCF Using Rods:] New strategy for finding the greatest common factor and least common multiple with word problems that require application of greatest common factors and least common multiples
 * [|AAA Math Online Exercises in Finding the Least Common Multiple]