http://neirtec.org/math/ - Mathematics Resources, Tools and Manipulatives Online
MathCats - Creative open-ended math explorations
Math Lessons - K-12 - an wonderful collection of Math lessons using the Web.
Abacus : The Art of Calculating with Beads
This site contains a Java-abacus, the history of the abacus, and instructions for use.
Dave's Math Tables
This site contains pages full of algebraic functions, geometry, calculus, and general math equations and formulas.
Eric's Treasure Trove of Mathematics
This site is a comprehensive online encyclopedia of mathematics equations, terms, and derivations.
You will find graphics and animations to download related to calculus problems. Animations and graphics are usually accompanied by interesting problems for presentation to students, such as finding the volume of water in a tipped glass.
History of Mathematics Archive
This is a searchable directory containing the biographies of over 1000 mathematicians. It is searchable by name, historical period, and country of origin.
Formerly known as the Geometry Forum, this updated and expanded Web site provides valuable mathematical information for you and your students. The Student Center offers aids for the confused, while the Teacher's Place contains classroom plans.
More Mathematics Resources