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| Abacus |
The abacus is a calculating tool for performing arithmetic calculations. It was in use centuries before the adoption of the written modern numerical system. In fact, Babylonians may have used the abacus for addition and subtraction.
Today, the abacus is sometimes used as a teaching tool to help young children understand numbers and some mathematical calculations are still done with abacus. The design of the abacus varies but generally it consists of a frame which has rods and wires. The rods hold beads which can be moved around on the frame to represent various numbers.
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