Roman abacus
The Roman hand abacus was one of the earliest known portable calculating devices, used in the Roman world. It was a base-10 form of the abacus, with movable beads held in slots rather than loose counters.
The Roman hand abacus was one of the earliest known portable calculating devices, used in the Roman world. It was a base-10 form of the abacus, with movable beads held in slots rather than loose counters.
The Roman hand abacus was one of the earliest known portable calculating devices, used in the Roman world. It was a base-10 form of the abacus, with movable beads held in slots rather than loose counters.
Source: Wikipedia "Roman abacus" · CC BY-SA 4.0
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