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an abacus is a Chinese type of adding machine and can still be found in authentic Chinese laundries. i remember i guess it was the 1st grade we had an abacus in the class room and you can also find them on baby toys and cribs . they are round differantly colored bits of wood and slide back and forth. i read somewhere that they were used in china a couple of thousand years ago
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How old is the abacus?
The Mesopotamians are believed to be the first civilization to have used abacuses, between around 2700-2300 BC.
Is the abacus an old version of the calculator?
Yes, abacuses (or is it abaci?) were used to calculate simple maths problems.
What is a abacus made of?
"Today, abacuses are often constructed as a bamboo frame with beads sliding on wires, but originally they were beans or stones moved in grooves in sand or on tablets of wood, stone, or metal." ~ Wikipedia
