André Heck is a project manager at the Faculty of Science of the Universiteit van Amsterdam, and he recently contributed this thoughtful article to the "Loci" project at the Mathematical Sciences Digital Library. In this...

An interactive site with exercises and basic information covering K-12 arithmetic, fractions, integers, decimals, algebra, geometry and statistics. Also: practical math: converters for currency, temperature, distance,...

Students may use this lesson to use geometry, trigonometry and GPS to locate a geocache in their area. With a handheld GPS device and the coordinates of the cache, geocachers attempt their own personal treasure hunt....

From J. J. O'Connor and E. F. Robertson at the University of St. Andrews in Scotland, this page covers Euclid's Elements through the end of the 1800's, with 23 references (books/articles). Each important name is a link...

Java applets: an area "workshop," which explains area and division by converting numbers in area units; an architect's toy blocks, with gravity; connecting and programming elementary logic (in the form of pipes with...