The first Abacus (plural Abaci) are believed to have come from Mesopotamia circa 2700 BC.
the Chinese abacus, called a suànpándates to around the 2nd cenruary BC and is beleived to be a copy of the Roman abacus from around the 1st centuary BC.
The Roman one was thought to be a stolen, and improved Persian abacus and the Persians believe to have copied the Egyptian one.
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How did the abacus occur?
the abacus replaced the abaci
Charles Babbage developed abacus in 1820 for information send email to sahil2828@gmail.com
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