In Roman numerals, if a lower valued letter is placed before a higher valued letter:

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C) In Roman numerals, if a lower-valued letter is placed before a higher-valued letter, the lower-valued letter is subtracted from the higher-valued letter. Examples: IX = 1 and 10. In this case, you must subtract 10 - 1 = 9 (IX = 9). XL = 10 and 50. In this case, you must subtract 50 - 10 = 40 (XL = 40). Roman numerals represent whole numbers, which are greater than zero. Roman numeral characters are not divided to arrive at their equivalent Arabic number value.

In Roman Numerals, If a Lower Valued Letter Is Placed