WebMATH
This is a really good site, because it lets you type in a math problem that you’re working on, and then it gives you a step-by-step guide on how to solve it. The site covers general math, algebra, geometry, calculus, and other stuff.
Whole Frog Project
OK, this is pretty cool – you can dissect a frog online. Well, obviously not REALLY….but pretty close! Just jump to the “Virtual Frog Dissection Kit”, and then don’t forget to click on the “Help” file – it will give you some tips for how to move the frog around.
www.algebra.com
This is one of the best sites. It’s created by people who really love algebra (who ARE these people??). Don’t click on any advertising links – just stick to the center area, find the type of problem you’re working on, and you’ll be able to see lessons, example problems, and more. It’s great.