One cool thing about the purely additive notation is that you can then add numbe... | Hacker News

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		tempestn on March 16, 2024 \| parent \| context \| favorite \| on: On clock faces, 4 is Expressed as IIII, not IV One cool thing about the purely additive notation is that you can then add numbers together by just gathering up all their characters, sorting largest to smallest, and combining any groups of 5 or more.

tempestn on March 16, 2024 [–]

Or in one step, by combining them from smallest to largest, combining and carrying as you go.

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