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A simple device for calculating, consisting of a frame with rows of wires or grooves along which beads are slid
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Abacus is a manual tool based on binary system for calculations

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The abacus, also called a counting frame, is a calculating tool that was in use in Europe, China and Russia, centuries before the adoption of the written Hindu–Arabic numeral system.
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Abacus is a thing used to teach children maths in early period of childhood. It is an instrument with beads which helps a person to learn counting.

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An abacus is a manual aid to calculating that consists of beads or disks that can be moved up and down on a series of sticks or strings within a usually wooden frame. The abacus itself doesn't calculate; it's simply a device for helping a human being to calculate by remembering what has been counted

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