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An abacus is an old tool used for arithmetic. It is still used in some parts of the world, and it is well suited for use in shops and street markets. Sometimes blind people use an abacus, because they can feel the numbers easily. The most common abacuses work by moving beads on rods.
Abacuses can do addition, subtraction, multiplication, division. They can be used to find the square root of whole numbers. Expert abacus users can sometimes do math faster than basic calculators.
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