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Who was the first person to use an abacus?
Nobody knows who was first because they were invented thousands of years ago in Babylon.
Which century was abacus invented?
Around 2500BC the first Abacus appeared in Sumaria. It arrived in Persia about 600BC. The Greek Abacus is recorded to have been in use about 500BC
Where is abacus used nowdays?
Thailand vegetable vendors use abacus, nowadays abacus is gaining popularity in India, US and taught by many schools
What countries still use the abacus?
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.
How do postal officers use math?
With an abacus.
