Abacus SummeryAn abacus is a device for addition,subtraction,multiplication,and division. It doesn't require the use of a pen and a paper, it's good for any base number system.The abacus was invented around 500B.C. The purpose was to be able to calculate math problems. When the Abacus was invented many people were better with math. Today's society is more advanced with calculators, but the ASbacus is still used.
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