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Where can I find a downloadable high school math textbook online?

I'm studying to get my teacher's certificate, and part of that includes taking some professional development courses along with my teacher training (teachers are also required to take a certain number of hours of professional development in order to keep their certification current). I'm taking a course right now that requires me to put together an online module for a unit that I am currently teaching. Of course, I'm not currently teaching anything (unlike all my classmates). So I plan to just find a high school math textbook somewhere and base my module on a unit in that textbook. But I can't find one at the moment. I don't want to pay $50+ dollars for one or wait for it to come in the mail. They don't have any at the library, or at Barnes and Noble. My next step is to look for one at the local used book stores near my house, but other than that, I'm stuck. Does anyone know where I can find a reasonably-priced ($30 or less.. or free!) high school math textbook online that I can just download? Any math subject, doesn't matter. As long as it's taught at the high school level and not college.

Public Comments

1. here http://www.totallyfreemath.com/