- National Council of Teachers of Mathematics - standards, project examples, and lesson plans
- Mathematical Association of America - articles, publications, resources, and faculty development
- NASA - official site of the National Aeronautics and Space Administration
- United States Census Bureau - including results of the 2000 census
- M. C. Escher - chronicles the work and life of the mathematician-artist
- Disaster Math - math applied to tornadoes, earthquakes, hurricanes, etc. (FEMA)
- Math Stuff - problems, help, history, geometry, and number theory for kids
- Women in Mathematics (The University of Oregon)
- Discovery School’s WebMath - homework help, word problems (The Discovery Channel)
- Origami and Math
- About.com Math
- Dave’s Math Tables - formulas, diagrams and proofs
- Interactive Mathematics Online - by and for high school students
- Calculator.com - converters for currency, time, units of measurement, etc.
- Ask Dr. Math - students, instructors, and mathematicians answer questions (Swarthmore College)
- Electronic Statistics Textbook - forecasting, survey data, complex factor analysis, etc.
- Internet Public Library: Programming (University of Michigan)
- Prime Pages - prime number research, records, and resources (University of Tennessee, Martin)
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