http://www.sharemylesson.com/high-school-algebra-teaching-resources/

Hosted by ShareMyLesson, this site provides algebra resources, including activities, worksheets, games, lesson plans, puzzles, posters, presentations, assessments and other ideas for you to use with your high school students.

http://edfarkasalg.blogspot.ca/

This link leads to a freely available on-line book, "Algebra Real-World (It's easier to understand than you think!)," written by Edward J. Farkas, Sc.D. This on-line book takes algebra out of the abstract and places it in a context that is readily understandable. In the high school curriculum, physics is the subject most relevant for providing this context.

http://www.adjectivenounmath.com

Teaching video lectures of prerequisite materials in arithmetic and algebra, presented by esteemed math teacher, Professor Herb Gross. This site is recommended both for students and for teachers—who want to see how to explain difficult concepts in crystal clear ways.

http://zonalandeducation.com/index.html

In Zona Land Education, you will find educational and entertaining items pertaining to physics, to the mathematical sciences, and to mathematics in general.

http://www.sharemylesson.com/high-school-geometry-teaching-resources/

Hosted by ShareMyLesson, this site provides geometry resources, including activities, worksheets, games, lesson plans, puzzles, posters, presentations, assessments and other ideas for you to use with your high school students.

http://www.mathinscience.info/

Use the search tools to find resources, which teach core math and science standards, integrate calculator and computer-based technologies, and introduce 21st Century concepts in the areas of fractal geometry, nanotechnology, and engineering.

http://mathbits.com/

MathBits.com is devoted to offering fun, yet challenging, lessons and activities in secondary (and college level) mathematics and computer programming for students and teachers. Created by two mathematics teachers

http://www.learner.org/resources/series210.html

Mathematics Illuminated is a video course for high school teachers and college level instruction; 13 half-hour video programs, online text, course guide, and Web site; graduate credit available.

http://mathforum.org/

The Math Forum, developed by the Drexel University School of Education, is a leading online resource for improving math learning, teaching, and communication since. It is run by teachers, mathematicians, researchers, students, and parents using the power of the Web to learn math and improve math education.

http://mmp.maths.org/

The Millennium Mathematics Project (MMP) is a maths education initiative for ages 5 to 19 and the general public, based at the University of Cambridge in England and active nationally and internationally. The program aims to support maths education and promote the development of mathematical skills and understanding, particularly through enrichment activities

http://mathworld.wolfram.com/about/

MathWorld is an extensive mathematical resource, provided as a free service to the world's mathematics and Internet communities as part of a commitment to education and educationa outreach by Wolfram Research, makers of Mathematica.

http://plus.maths.org/content/

This site, sponsored by +Plus Magazine: Living Mathematics, provides articles from the top mathematicians and science writers on topics as diverse as art, medicine, cosmology and sport.

http://www.shodor.org/interactivate/guide/

Shodor is a nonprofit organization serving students and educators by providing materials and instruction relating to computational science (scientific, interactive computing). Shodor Interactivate is a set of free, online courseware for exploration in science and mathematics. It is comprised of activities, lessons, and discussions.

http://www.ics.uci.edu/~eppstein/junkyard/

These pages have been provided by Professor David Eppstein of the Computer Science Department at the University of California in Irvine. They contain usenet clippings, web pointers, lecture notes, research excerpts, papers, abstracts, programs, problems, and other content related to discrete and computational geometry. Professor Eppstein writes that “while some of it is quite serious, I hope much of it is also entertaining

http://www.ics.uci.edu/~eppstein/geom.html

This is a second site provided by Professor Eppstein. It collects various areas in which ideas from discrete and computational geometry (meaning mainly low-dimensional Euclidean geometry) meet some real world applications. It contains brief descriptions of those applications and the geometric questions arising from them, as well as pointers to web pages on the applications themselves and on their geometric connections.

http://www.cut-the-knot.org/

This site is for teachers, parents and students who seek engaging mathematics. Many of the topics are accompanied by Java illustrations. There are more than 900 Java applets. The applets can be licensed by teachers for inclusion in their own pages.

http://archives.math.utk.edu/k12.html#topics

This site, sponsored by the Math Archives, presents specific areas of mathematics for use by teachers and students.

http://www.graphcalc.com/

This site provides a free calculator program for P.C.'s.

http://www-history.mcs.st-and.ac.uk/history/index.html

This site has biographies of over 1300 mathematicians, plus other articles on the history of mathematics.

http://www.gedonlinediploma.com/math_resources.html

This site, sponsored by Columbia North High School GED Online Diploma, presents an excellent and comprehensive listing of math resources for high school teachers and students.

http://mathnexus.wwu.edu

The Math Nexus website brings experiences into mathematics classrooms each day as a collective resource for challenging problems, responses to teacher questions, and real-world uses of mathematics. It also includes announcements of conferences and workshops, humor, and mathematics history tidbits.