Algebra
HippoCampus Math Mini-Site http://math.hippocampus.org/
GED Math content covered in small sections. Each section includes "homework," practice questions for that concept. Note: although this site is labeled "Math" it only covers Algebra content.
Number Patterns Game http://www.funbrain.com/cracker/index.html
A fun way to learn and practice pattern completion. Has multiple levels, so you can start with easy patterns and work your way to complex ones.
Order of Operations Introduction
http://www.khanacademy.org/video/introduction-to-order-of-operations?playlist=Pre-algebra
Learn and practice order of operations.
Order of Operations for Complex Problems
http://www.khanacademy.org/video/more-complicated-order-of-operations-example?playlist=Pre-algebra
Learn and practice order of operations for complex, multi-step problems.
Order of Operations Practice
http://www.khanacademy.org/video/order-of-operations?playlist=ck12.org%20Algebra%201%20Examples
Watch order of operations problems solved.
Order of Operations Matching http://www.quia.com/mc/281615.html
Match problems with their correct answers by using the Order of Operations correctly.
Build Your Own Equations
http://mphgames.com/krypto/instructions.htm
Challenge yourself to build equations for a specific answer from 5 random numbers!