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What is the Difference between Additive notation and Subtractive notation in Roman numerals?

correct me if im wrong but this is an example of Additive: XXXIII = 10 + 10 + 10 + 1 + 1 + 1 = 33

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    See http://groups.google.com/group/sci.math/browse_thread/thread/590a24a7df8a670f2012-07-02

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IIII and IV are both used for 4. IIII is additive; IV is subtractive.

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    @Andy This seems to be the opposite of what Wikipedia claims: https://en.wikipedia.org/wiki/Subtractive_notation2017-12-26