Thailand vegetable vendors use abacus, nowadays abacus is gaining popularity in India, US and taught by many schools
they are used to count so you don't have to use your fingers because they didn't have calculators in the tome of the invention of the abacus. even instead of using chalk because there is no pint in wasting materials when you can repeatedky use when over
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.
The abacus was originally used to add and subtract. It was much faster than an adding machine. Its weakness was that it did not leave a paper trail.
The Sumerian abacus appeared in 2700 BC, a primitive device which was difficult to use. The Persians used the abacus in 600 BC. The Greek abacus dated to the 5th Century BC. The Chinese dated to the 2nd Century BC
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