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Abacus: A brief Introduction

Abacus: A brief Introduction. Chi-Kwong Li. History of Chinese Abacus. The abacus is called suanpan - the counting tray. It is a calculating tool for performing arithmetic processes. The earliest known written documentation of the Chinese abacus dates to the 2nd century BC.

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Abacus: A brief Introduction

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  1. Abacus: A brief Introduction Chi-Kwong Li

  2. History of Chinese Abacus • The abacus is called suanpan - the counting tray. • It is a calculating tool for performing arithmetic processes. • The earliest known written documentation of the • Chinese abacus dates to the 2nd century BC. • Very efficient suanpan techniques have been developed • to do addition, subtraction, multiplication, division, • square root and cubic root operations. • In the famous long scroll Along the River During the • Qingming Festival by Zhang Zeduan (1085 –1145 AD) • during the Song Dynasty (960–1297 AD), an abacus • (suanpan) is clearly seen.

  3. A demonstration and some discussion • A demonstration. • Illustrations of: • grouping in addition; • decomposing higher digits for subtraction; • operating from the leftmost digits; • arithmetic of numbers in different bases, etc. • A discussion of finding square roots. • A Youtube clip.

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