what's the abacus? find this fast
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An abacus is a manual aid to calculating that consist of beads or disks that can be moved up and down on a series of sticks or strings within a usually wooden frame.
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The abacus (plural abaci or abacuses), also called a counting frame, is a calculating tool that was in use in the ancient Near East, Europe, China, and Russia, centuries before the adoption of the written Arabic numeral system. ... Abacuses are still made, often as a bamboo frame with beads sliding on wires.
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