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.
•
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.
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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