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Live Chinese Abacus
This excellent site has an interactive abacus
you can use along with Links to many other sites.
http://www.cut-the-knot.com/blue/Abacus.shtml
The Abacus Index
This is a very comprehensive site which will explain how to use an abacus
for all elementary operations, but you will need to work a bit to use
this site.
http://www.ee.ryerson.ca/~elf/abacus/
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