A comprehensive mathematical resource, offering proofs, a glossary, games and puzzles (many using Java applets), and other eye openers.

Powerful mathematics tools for online use: calculators, solvers plus facts, theory and a section with math games.

Math information for students, teachers, researchers and parents. Ask Dr. Math service, lessons plans, discussion groups, newsletter.

Online display of an exhibit exploring the universe in terms of scale. Includes presentations, forums, activities, educators resources, and explorations, with a shop for related media items.

A community of volunteers who present games, tools, articles, and information about math and science.

Contains sections on basic arithmetic, trigonometry, precalculus, and real numbers.

Research articles, preprints, and journals. The three main categories covered are applied mathematics, pure mathematics, and probability and statistics. Also includes mathematics problems and news.

Educates readers about the uses of probability and statistics in current news reporting. Offers lectures, videos, teaching aids, online texts, and interesting articles demonstrating concepts.

Includes a mistake of the month, an archive of past mistakes, reader responses, puzzles and problems, and math in the news.

Online learning community dedicated to the teaching and learning of mathematics. Activities, lesson plans, courses, news, and FAQs.

Fun and challenging math activities created by Cynthia Lanius, the executive director of the Center for Excellence and Equity in Education at Rice University.

An extensive encyclopedia of mathematical terminology indexed by subject.

Searchable site of math e-prints and articles, maintained at Los Alamos.