math

This site features textbooks in a flexible format called "Flexbooks" available for free download and printing.  Most programs include a Teacher's Edition, workbooks, and other supplementary material, all for free.  The topics at the moment include middle school and high school level math and science.  The science is mainstream (evolution is included in Life Science and Biology programs).  The Chemistry course includes labs.  The math is fairly traditional and includes Algebra, Geometry, Trigonometry, Probability & Statistics (AP), and Calculus (AB).  Free S

Illuminations is a website maintianed by the National Council of Teachers of Mathematics.  The website has interactive math games that allow kids to explore math concepts or review math facts, without being tedious drills.  A few favorites in our house:

Virtual age-dating is an interactive tool that describes how geologists and archeologists are able to determine the age of samples.  Aimed at high school level and above, but an interested middle school level child could grasp the concepts introduced with help.  Students should be familiar with the concept of ions , percentages and how to read data off a graph to do the exercise.  FWIW, I think the scale of some of the graphs are poorly chosen, and make it difficult to be as precise as the exercise requires; a per

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