http://www.khanacademy.org/ A huge library of intermediate and secondary YouTube math videos. This website is excellent for reteaching of concepts.
http://www.purplemath.com/modules/index.htm An excellent resource for help with Pre-Algebra, Algebra, Geometry, & Trigonometry concepts (including word problems). These lessons are written using a student mind. It shows different techniques and common errors.
http://www.math-drills.com/multiplication.php
This is a great resource to use to practice multiplication facts
http://www.xpmath.com/ Great intermediate math games to reinforce learned skills
http://www.mangamath.com/ Great high-interest math games for all levels. Check it out!
http://www.mangahigh.com/en_gb/games/flowerpower Excellent game that works on comparing and ordering fractions, decimals, and whole numbers. Very engaging for any level of student
http://mathbits.com/Caching/MathCacheDirectionsOpen.html A fun scavenger hunt style activity with math problems