Abacus

The abacus is a device typically consisting of beads strung on wires or wooden rods, which can be moved from one side of the rack to another to indicate numbers. There are many types.

Various versions of the abacus counting device can be traced back to at least 3,000 B.C.E.

In some parts of the world, versions of the abacus have been used continuously for thousands of years.

 


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