Note that as mentioned in the article, Romans very rarely used the subtractive n... | Hacker News

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Sharlin on July 27, 2020 | parent | context | favorite | on: How did anyone do math in Roman numerals? (2017)

Note that as mentioned in the article, Romans very rarely used the subtractive notation. So in general 4 was IIII and 9 was VIIII.

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