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demonstration
Demonstration
The equipments for carrying out rod calculus=Counting Rods+Counting Board.
"Molecular structure of Counting rods "= bamboo sticks, about 12 cm- 15 cm in length, 2mm to 4 mm diameter
-A simple 45 phrase positional decimal multiplication table.
-This multiplication table was learned by heart by pupils,merchants and mathematicians alike.
The 9x9 multiplication song!
-Counting rods were used by ancient Chinese for more than two thousand years.
-In 1954, forty-odd counting rods of the Warring States period
-The use of counting rods must predate it; the Laozi, a text originating from the Warring States, said "a good calculator doesn't use counting rods." The Book of Han recorded: "they calculate with bamboo, diameter one fen, length six cun, arranged into a hexagonal bundle of two hundred seventy one pieces."
-In 1973, archeologists unearthed a number of wood scripts from a Han dynasty tomb in Hubei, one of the wooden script written:“()",this is one of the earliest examples of using counting rod numeral in writing.
-After the abacus flourished, counting rods were abandoned except in Japan, where rod numerals developed into symbolic notation for algebra.