I didn't think it was really an 'excellent' math board, but it looks nice. For all you math geeks... Math Help Boards | Free Math Help

If you need some additional material, I can provide some textbooks ( pdf) that cover most of the topics for high school. If you are interested, PM me and I'll send you the link.

I also have about 10 GB of math books. Mostly university level but I also have some high school level math books. If someone is interested (I got them from torrents shhhh)) PM me and I can send you a link.

Good luck with your quest, Alexander. Post a bit more first. Get to know the board and the posters. We are a sharing community, so I hope you have a lot to offer as well.

Lazy evening turned into a math marathon for me last night. Subtracting Radical Expressions - YouTube Fort Bend Tutoring on you tube. Clear explanations by a cool sounding guy. Might be useful for your students or as an idea mine for you. Just be careful it is addictive.

^I think the US has a drone program designed specifically to subtract radicals: however, i think it is far less accurate than doing so on paper. pen>sword.