The abacus is one of many counting devices invented in ancient times to help count large numbers, but it is believed that the abacus was first used by the Babylonians as early as 2,400 B.C.1 The abacus was in use in Europe, China, and Russia, centuries before the adoption of the written Hindu-Arabic numeral system.

Who invented abacus and when was it invented?

Abacus was invented by Chinese in 500 BC (while some indications argue on its invention by Babylonians in 300 BC) and was used as one of the most primitive calculators (or counting device to be precise).

Who is founder of abacus?

Tim Cranmer is credited for a robust calculating machine abacus. Cranmer was blind, and he built an abacus to help himself and others like him to calculate. Blind people still use his abacus for calculations.