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I'm tutoring high school students in Math for a local College and Career prep program and would like to have a reference book on hand that I can consult. I'm a Comp Sci graduate so I have a pretty strong background in Math but it's been a while since I used high school level Algebra and Geometry.

Are there any good reference books that I could have on hand to brush up if I run into something I don't remember? I typically just need to browse a short description and an example before things start coming back and I can help students. Preferably cheap, I probably won't need it very often after a few months of tutoring. The ideal book would be something that is quickly browsable with a concise description of topics, and maybe cross references to related topics.

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Search free ebooks at project Gutenberg (gutenberg.org) and you will find samples of both and the price is right! You might also want to get Schaum's outline in both subjects and might find them for a penny in both Algebra and Geometry! HTH ~A –  Amzoti Sep 19 '12 at 22:03
    
I run a site called theassyer.org that catalogs free books. My general experience is that free books in math are heavily weighted toward the higher levels, e.g., graduate-level texts. It gets to be slim pickings when you get to the K-12 level. I don't see anything reasonable for high school geometry. –  Ben Crowell Sep 20 '12 at 4:22
    
@BenCrowell After looking through project Gutenberg that seems to be the case there too. –  Andrew Myers Sep 20 '12 at 12:17

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