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IIS The Romans counted fractions in 1/12ths. S is for 6/12 (or 1/2). To make fractions less than 6/12, make a dot in front of S for each 1/12. And to make fractions larger than 6/12 make a dot after the S for each 1/12. See the link to the Wikipedia article for more explanation of this.

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16y ago

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