Who Was the First to Use an Abacus
In Japan the abacus is called soroban 算盤 そろばん lit. The device was made of wood with metal re-inforcements.
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Counting trayIt was imported from China in the 14th century.
. On each rod the classic Chinese abacus has 2 beads on the upper deck and 5 on the lower deck. It was probably in use by the working class a century or more before the ruling class adopted it as the class structure obstructed such changes. The abacus called Suan-Pan in Chinese as it appears today was first chronicled circa 1200 CE.
The 14 abacus which removes the seldom-used second and fifth bead became popular in the 1940s. Such an abacus is also referred to as a 25 abacus.
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