• TaTTe@lemmy.world
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    3 days ago

    The general rule is that the larger symbols come first in Roman numerals, so 12+10 (22) would be written as 10+10+1+1 or XXII.

    If you literally meant the arithmetic 12+10, I’d assume they used some symbol for addition, so it would be written as XII+X, but I can’t say for sure.