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. Expert, or very good, abacus users can sometimes do math quicker than basic calculators. There is a common chinese abacus. This abacus is splited into two basic rows, one row for the "5"s, and the bottom row for the "ones". There is one or two beads in the top row, and four or five beads in the bottom one. For example, 8 is, one on top, and 3 below, because 5 + 3 = 8. Every collumn represents a diffrent digit.
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[change] Other websites
[change] General and historical articles
[change] Tutorials
- Manual de uso del Abaco Japonés Soroban
- Min Multimedia
- Suan Pan
- Abacus: Mystery of the Bead - an Abacus Manual