The upper part of an abacus consists of one bead each that has the value of 'five'.
The lower part of an abacus consists of four beads and each of them has value 'one'.
All the beads in one grid together add up to the value 'nine'.
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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
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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