Swarthmore Mathematics Forum-probably the most comprehensive web-site for mathematics on the WWW.
Richard Parris's Home Page-Richard has developed a large amount of free shareware for mathematics classes of all Grades. This software is free to download at his web-page.
Ron Mayeda's Home Page-Ron, a veteran teacher of 35 years experience has put together this mathematics web-page which rivals Swathmore on sheer volume and excellent links
The Educational Combinatorial Object Server-How many ways are there to make change for one dollar using an unlimited number of coins and all denominations?ECOS is a teaching tool which generates permutations, subsets and combinations by the user define the parameters of discrete objects.
Exercises in Math Readiness-Students preparing for post secondary studies will be leaping on to this site to prepare for the road ahead. Exercises in Mathe Readiness (EMR) is a collection of exercises designed to hone skills in those mathematical topics most important for university study in mathematics, sciences, engineering and commerce.
Math Central-Have any nagging math problems you can't solve, or just curious about something? Ask Math Central: a site for K-12 mathematics students and teachers. Your queries will be answered by mathematics and education students and faculty from the University of Regina. A new and improved Math Central site is now in development.
Word Problems for Kids-Jack and Jill went up the hill to fetch a pail of water which weighed 1.5 kg...Looking for something new? Word problems for kids is designed for classroom uses. These problems are classified into levels suitable for grades five to twelve and are carefully selected to help students improve their problem-solving skills.
Eisenhower National Clearinghouse for Science and Mathematics teaching-Includes a number of very good journal articles available in full. I would recommend going to Math under lessons and activities. Note: this site takes a long time to load!
Math Archives-An extensive database of mathematical information. Has a search database form.
Mathematician Database-This is an excellent site at St.Andrew's University, Scotland. Contains everything from a famous curve index to a Mathematician of the day page. Information on approximately 1000 mathematicians is here.
Mathematical Resources at Caltech-An A to Z listing of mathematical resources. Some concepts might be too advanced for the "average" high school mathematics students.
Polyhedra Site-Professor George Hart's awesome polyhedra site. Here, you can spin models, make your own models etc.
Geometry Junkyard-The "junkyard" is eclectic and entertaining. A place for "advanced" students to investigate mathematics.
Polyhedra Puzzles Puzzles with polyhedra and numbers. You can print copies of the puzzles and read several articles on the subject
Texas Instruments Calculator Home Page-this site contains everthing you want to know about the TI line of calculators.
Calculator Archives-One of the many site on the World Wide Web dedicated to the use of graphing calculators. Has some links to some other sites. Helpful!
NCTM Web Page-the NCTM (National Council for Teachers of Mathematics) is the largest and most powerful organization for teachers of Mathematics in North America.
High Performance Systems Ltd.-System Dynamics Modelling is a "new" approach to modelling and problem-solving which has gained a lot of momentum in schools and universities across the country. High Performance systems is a company which develops software (ie. STELLA) which utilize the system dynamics approach.
Educational Resources on the Internet-This page links to various educational educational resources on the Internet ie. ERIC