Algebra.com: Pre-Algebra - Pre-Algebra homework help, tutorials, solvers, and lessons
Algebra Vocabulary - 15 algebra vocabulary terms you should know
Math Algebra - tons of links to great pre-algebra sources
Math Exercises - check out the Pre-Algebra section!
LACOE's MathStar: Basic Algebraic Thinking - four interactive lessons from the Los Angeles County Office of Education - Menu Math, Introducing Integers, Adding Integers, and Subtracting Integers
Cool Math: Pre-Algebra - a ton of really easy to understand pre-algebra lessons
National Library of Virtual Manipulatives: Algebra - scroll down to the grades 6-8 section and you'll find several cool interactives
Algebra Word Problem Solvers - need help understanding algebraic word problems? Check out this site!
Equation Match - a fun game with basic algebraic equations
Ask Dr. Math: Middle School Algebra - loads of great pre-algebra tutorials!
AAA Math: Equations - from evaluating expressions to solving equations, this site has some great lessons to aid in the comprehension of the topic
Pre-Algebra Homework Help, Solvers, Free Tutors, Lessons - several topics with a lesson, solvers, frequently asked questions, and a form to ask tutors questions
Free Pre-Algebra Worksheets - This site is amazing! It has dozens of fantastic worksheets, all of them useful for any middle school teacher of mathematics.
Math Online: Pre-Algebra Worksheets
Order of Operations Worksheets
Games and Quizzes