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Abacus
An abacus computes numbers by sliding beads on rods. In this Demonstration, click a bead to move it. The upper disks add 5. Thus each row can store the digits between 0 and 9.




"Abacus" from The Wolfram Demonstrations Project
 http://demonstrations.wolfram.com/Abacus/
Contributed by: Michael Schreiber
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