- Abacus - Wikipedia
Abacus-based mental calculation (AMC), which was derived from the abacus, is the act of performing calculations, including addition, subtraction, multiplication, and division, in the mind by manipulating an imagined abacus
- How to Use an Abacus (with Pictures) - wikiHow
The abacus (the suanpan is the most useful variety) is a deceptively simple calculating tool still used all over the world It's a useful learning device for the visually impaired, as well as for anyone who wants to learn the roots of the modern calculator
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- The Abacus and the Numeral Frame - National Museum of American History
The abacus is a computing device on which arithmetic calculations are performed by sliding counters (beads, pebbles, or flat discs) along rods, wires or lines The instrument may have originated in the Middle East before the time of Christ Small stones known as calculi, from the Greek khalix, pebble, were moved along lines drawn in stone or sand Our modern terms “calculate” and
- Abacus - New World Encyclopedia
An abacus (plurals abacuses or abaci), also called a counting frame, is a calculating tool for performing arithmetical processes, often constructed as a wooden frame with beads sliding on wires
- Abacus - Math is Fun
Sometimes blind people will use an abacus, because they can feel the numbers easily Expert abacus users can sometimes do calculations faster than on a calculator, and can even use them to find the square root of whole numbers
- Abacus | Encyclopedia. com
The abacus, an ancient calculating device, probably originated in Babylon around 2400 B C E as a "counting box " It was the world's first calculator, and contemporary versions are still in use today
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