Roman abacus
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The Ancient Romans developed the Roman hand abacus, a portable, but less capable, base-10 version of earlier abacuses like those that were used by the Greeks and Babylonians.[1]
![Thumb image](http://upload.wikimedia.org/wikipedia/commons/b/b5/RomanAbacusRecon.jpg)
![Thumb image](http://upload.wikimedia.org/wikipedia/commons/thumb/7/72/Roman_tablet_employed_in_making_arithmetical_calculations_%2814781129921%29.jpg/640px-Roman_tablet_employed_in_making_arithmetical_calculations_%2814781129921%29.jpg)
The Ancient Romans developed the Roman hand abacus, a portable, but less capable, base-10 version of earlier abacuses like those that were used by the Greeks and Babylonians.[1]