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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.

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 Michael Schreiber
"Abacus"
 http://demonstrations.wolfram.com/Abacus/
 Wolfram Demonstrations Project
 Published: June 25, 2009
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