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There was evidence of the abacus going back as early as 2700 B.C. And it is still commonly used in certain countries and places like Japan, China, Russia, and the Middle East.
The Abacus.
Yes it is. they teach it in school. It is primarily used to teach little kids in kitnergarden and elementary school to add and subtract.
Thailand vegetable vendors use abacus, nowadays abacus is gaining popularity in India, US and taught by many schools
An abacus is a calculating tool used primarily in parts of Asia for arithmetic. The abacus was in use centuries before the written modern numeral system and is still used by merchants, traders and clerks in Asia and Africa.