One of the very best math sites is Ask Dr. Math Elementary grades and up. Email help available.
Forgotten the formula for figuring the area of a triangle? (Or, if you're like some of us, you never knew it in the first place.) Check out Dave's Math Tables for all of your theorems, tables, proofs, and graphs. The site is available in Spanish too!
Internet Mathematics Library has it all. Brought to you by Math Forum.
Math Homework Help has all the math formulas you could need, and you can get email help on specific problems. (Pre-algebra, algebra I & II, college algebra, geometry, trigonometry, pre-calculus, calculus.)
MathMagic is a K-12 telecommunications project developed in El Paso, Texas. MathMagic posts challenges in each of four categories (k-3, 4-6, 7-9 and 10-12) to trigger each registered team to pair up with another team and engage in a problem-solving dialog. When an agreement has been reached, one solution is posted for every pair.
ThinkQuest provides some interesting ways of learning math skills. One of them is the HEX Agency: a high-stakes espionage game with a little of Mission Impossible thrown in. WARNING: YOU HAVE INFILTRATED THE HEX AGENCY! (If I were better at math, I'd play. :) Honest.)
Internet Mathematics Library Algebra Links (P.S.: anything Math Forum does is great!)
From Hypatia to Vivienne Malone-Mayes, the Chronological Index of Women Mathematicians provides biographies and pictures, links and further reading lists. All entries are written by professors and students.
Mathematician's Biographies has short to long biographies of mathematician's worldwide. You can search by name, time period, and there's a special section for women mathematicians. Grades 4 and up.
Muslim Scientists, Mathematicians and Astronomers before the European Renaissance, 700 - 1500 C.E.
Biography of Euler
Euler's Solution: The Degree of a Vertex
Math Forum: Bridges of Konigsberg
History of Mathematics
Babylonian and Egyptian mathematics
History of Mathematics archive (includes brief biographies)
geometry in greater detail
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