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Abacus

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by

Veronica Yu

on 11 November 2013

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Transcript of Abacus

Abacus
Origin:
2700–2300 BC Sumerian
around 600 BC Persians
5th century BC Greeks
Chinese Abacus
HISTORY:
the 2nd century BC
190 CE Eastern Han Dynasty
(‘Supplementary Notes on the Art of Figures’ - Xu Yue)
Song Dynasty (960-1279)
Along the River During Qing Ming Festival- Zhang Zeduan
structure:
20 cm (8 in) tall width ??
more than 7 rods
beads 5+2 (rounded + hardwood)
beam
usage:
move beads up or down towards the beam
do ×, ÷, +, -,√square root, cube root at high speed
Accountant Certificate:
accounting computerization= level 3 abacus

decim
al s
ystem
Tan
g Dy
nasty (
618-
907 AD)
India

Suanpan
bead arithmetic
Full transcript