An abacus is a deceptively simple calculating tool that has been used since ancient times. It is generally used by the blind to perform multiplication, addition, subtraction and division.
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Thailand vegetable vendors use abacus, nowadays abacus is gaining popularity in India, US and taught by many schools
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
england
With an abacus.
yes