Find out more about this on our Roman numerals page. Why Does XIX Equal The Number 19? In the case of the equation XIX, the I (1) is written before the second X (10), which means that the smaller number needs to be subtracted from the larger one. This therefore gives us the math...
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This gives us the answer of 1,320. In Roman numerals, this equates to MCCCXX, which is in actual fact not quite as long a Roman numeral equation as it could be. There are certainly longer ones, such as the number 3,999 for example which is MMMCMXCIX! To work out why MCCCXX equal...