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A comment on How Did Anyone Do Math in Roman Numerals?. Parent comment

Re:How Did Anyone Do Math in Roman Numerals? by crowbahr on Friday July 21, 2017 @01:35PM (#14822329)
V + I = VI though.

You just have to put the larger number first for the addition.

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Re:How Did Anyone Do Math in Roman Numerals? by dllthomas on Friday July 21, 2017 @05:17PM (#14823806)
That might be enough to prevent you from getting any well-formed wrong answers.

It's not enough of the story, though - consider:

    VI + V = VIV
    V + IV = VIV
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