Abacus
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Abacus is a very old tool used for arithmetic. 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.
Abacuses can do addition, subtraction, multiplication, division, and people can use them to find the square root of whole numbers.
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- Bernazzani's Soroban Abacus Handbook
- Manual de uso del Abaco Japonés Soroban
- Min Multimedia
- Suan Pan
- Abacus: Mystery of the Bead - an Abacus Manual