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Mathematics Enhancement Programme- free curriculum for all ages
This is a complete mathematics curriculum available free online, including printable practice books, lesson plans, and copy masters. It was developed for the UK, and goes from "Reception", which seems to be analogous to kindergarten in the US, up through year 11 (similar to 11th grade). There are 2 versions of the 10-11th year curriculum, only one of which seems to be for college-bound students. The collegebound version includes guidance for customizing the curriculum for advanced students. The version of the 12th year intended for collegebound students is not
Mathalicious
A website dedicated to the idea that math is best learned when it is used as a tool to learn about something else. Covers Middle school math and algebra 1 and 2. Be sure to read the lessons thoroughly, some subjects may be inappropriate for sensitive or young kids.