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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.
Thailand vegetable vendors use abacus, nowadays abacus is gaining popularity in India, US and taught by many schools
The abacus was used in Russian even as late as 1976 in grocery stores in Moscow. Basically any country that does not have access to a cheap pocket calculator. I'm sure you can find many places in third world countries that use it for business transactions. It needs no batteries and when used by a person proficient in abacus, it can provide a correct answer as quick as a calculator.
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.