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# Chinese Abacus

Abacus
by

## Edward Cheng

on 8 June 2010

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#### Transcript of Chinese Abacus

Chinese Abacus Parts of an abacus Cheng Dawei A chinese person using an abacus in math is faster than an american using a calculator. Chronolgy:

500's-1000's
Country of origin and first appearance unknown. Region of development: Middle East

1300's
Modern Abacus in use in China

1400's
Abacus in use in Korea

1600's
Abacus known as Soroban in use in Japan

1700's
Last use of abacus in Europe, driven away by the introduction of the Hindu-Arabic notation of numbers There are many different versions of the abacus Korean Standard Example Below:The Abacus is set to Zero (no beads are pushed towards the center divider bar)
Example Below: Abacus set to 15 (one 10 unit bead and one 1 unit bead was added)
Example Below: Abacus set to 517 (one 500 unit bead, one 10 unit bead, one 5 unit bead, and two 1 unit beads) In China the abacus is called a suanpan. The upper deck has two beads in each column , and the the lower deck has five beeds in each column. To add numbers on the abacus, beads are moved toward the middle. To subtract beads are moved back to the edge of the frame. Pictures of an Abacus Abacus Calculator by Jeremy Lau, Edward Cheng, and Justin Qu The abacus was made by Cheng Dawei of the Ming Dynasty (1368-1644) Chinese American Examples Sources http://www.west-meet-east.com/abacus.htm http://www.qi-journal.com/culture.asp?-Token.Fi... http://www.chinaculture.org/img/2004-03/30/xins... http://www.chinaculture.org/gb/en_chinaway/2004...
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