How does the abacus work?
There are many types but I’ll offer some links: An abacus is a calculation tool, often constructed as a wooden frame with beads sliding on wires. It was in use centuries before the adoption of the written Hindu-Arabic numeral system and is still widely used by merchants and clerks in China, Japan, Hong Kong, Africa and elsewhere. http://webhome.idirect.com/~totton/abacus/pages.htm This page will teach you. Here is an online one to practice with. http://www.tux.org/~bagleyd/java/AbacusAppJS.html More links The Abacus: The Art of Calculating with Beads http://www.ee.ryerson.ca/~elf/abacus/ Math Mojo with the Abacus
