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Abacus. Hands carrying out a calculation using an abacus. An abacus is an early form of arithmetic calculator. Its name is derived from a method of counting using stones on a 'flat surface' (an abacus in Latin) that was familiar to the ancient Greeks and Romans. The modern abacus consists of beads on a frame. Experienced users may perform calculations faster than by using an electronic calculator, but the technique needs practice.
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