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Abacus |
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Abacus An instrument allowing one to quickly add and subtract numbers. Generally, an abacus is composed of a rectangular frame in which horizontal rods are partially covered with beads. The beads may be moved one way or the other to make calculations. It was invented in China in the 2nd century CE and is considered the earliest calculator. Want to thank TFD for its existence? Tell a friend about us, add a link to this page, add the site to iGoogle, or visit the webmaster's page for free fun content. |
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No references found | Abbacus Though the method is old, there are different kinds of Abbacus in the toy stores today. |
Abbacus |
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