Abacus
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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.
Contributed by: Michael Schreiber (June 2009)
Open content licensed under CC BY-NC-SA
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"Abacus"
http://demonstrations.wolfram.com/Abacus/
Wolfram Demonstrations Project
Published: June 25 2009