= 10 li, 1 li = 10 hao, 10 hao = 1 shi, 1 shi = 10 hu.

1 chi 2 cun 3 fen 4 li 5 hao 6 shi 7 hu is laid out on counting board as

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where is the unit measurement chi.

Southern Song dynasty mathematician Qin Jiushao extended the use of decimal fraction beyond metrology. In his book Mathematical Treatise in Nine Sections, he formally expressed 1.1446154 day as

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