The Abacus (24 jan 2500 ano antes da era comum – 24 dez 2500 ano antes da era comum)

Descrição:

The abacus is believed to be created in Sumeria. This is also believed to be one of the oldest computation devices. The abacus is used to add and subtract numbers. It uses columns of beads/pebbles/shells which can be manipulated by the user to make their calculations.

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