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Ancient Chinese Mathematics (a very short summary)
in very wide use by 300 CE. Numbers were denoted by patterns known as Zongs and Hengs. These represented alternate powers of 10: Zongs denoted units, 100’s, 10000’s, etc., while Hengs were for 10’s, 1000’s, 100000’s, etc. Rod numerals were immensely practical. In extremis they could easily be scratched in the dirt. More
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