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The china had one with rows wooden round balls on wires, 3 rows of them, 3 balls & 3 balls =6 in the last row, that was add, to subtract it was to the left cool

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The earliest recorded calculating device is the abacus. Used as a simple computing device for performing arithmetic, the abacus most likely appeared first in Babylonia (now Iraq) over 5000 years ago.


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