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Rules of writing roman numerals with examples While writing, the Roman number system , like the Hindu-Arabic number system, has several rules that must be followed. As a result, the five laws of Roman numerals are as follows: I. The value of a sign increases with each repetition. Example:  XX = 10+10=20 II. Only I, X, C, and M can be repeated three times consecutively. In addition, the integers L, V, and D cannot be repeated. Otherwise, the number will become invalid. Example: Roman Numbers Valid/Invalid MCXXXXIII         Invalid XXII                Valid LLXXII                Invalid LXI                        Valid III. In addition, the digit with the greater value moves to the left of the digit with the lower value. Example: 10 + 2 = 12 X + II = XII IV. In subtraction, the higher value digit follows the lower value digit to the right. Example: 10 – 1 = 9 X – I = IX V. Subtraction can only be done using the letters I, X, and C. Click to know