What is Abacus_?
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36
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A frame containing wires with small balls that move along them. It is used for counting
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An abacus is a very old tool used for math. It is still used in some parts of the world. Sometimes blind people will use an abacus, because they can feel the numbers easily. The most common abacuses work by moving beads on rods. ... There are one or two beads in the top rows, and four or five beads in the bottom ones.
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