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Abacus: The Art of Calculating With Beads
Provides extensive information on the history, construction, and use of the abacus (including detailed instructions on performing addition and subtraction functions), as well as comparisons of abacuses from different cultures. Features an interactive abacus that indicates the value of each column by clicking on the mouse to manipulate the beads. Also contains resources for teachers.
http://www.ee.ryerson.ca:8080/~elf/abacus/
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