Abacus. The abacus is an early form of arithmetic calculator. Its name is derived from a method of counting using stones on a 'flat surface' (= abacus,Latin),familiar to the ancient Greeks and Romans. The modern abacus consists of beads on a frame,known as a soroban in Japan and a shchoty in Russia. Experienced users may perform calculations faster than by using an electronic calculator,but the technique needs practice | |
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