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How do you add Roman numerals?

Updated: 10/24/2022
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8y ago

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Ok for this example lets take the number 19 XIX and add it to 21 XXI. All you have to do is put them together and combine all like numbers for example here we have XXXIXI. Now to simplify your numbers we know that M = 1000, D = 500, C = 100, L = 50, X = 10, V = 5, I = 1. So we know that this number that adds up to 40 can be written in its simplest form as XL.

Here is another: DCXIII + DCCLXXVII (613+777) = 1390

Combine like numbers DDCCCLXXXVIIIII, now simplify. DD (1000) can be written as M, CCC (300) can be left as CCC, and LXXXVIIIII can be simplified to LXXXVV, and then to LXXXX, and then some more to LXL, and finally to XC (90). Now combine your results and you end up with MCCCXC which is 1390.

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9y ago
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8y ago

Convert them to normal cardinal numbers first and then add normally.

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Q: How do you add Roman numerals?
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