MMCMX

MMCMX is a Roman numeral that represents the number 1990. It is constructed by combining the numeral for one thousand (M), the numeral for nine hundred (CM), and the numeral for ninety (XC). The 'M' signifies 1000. The 'CM' represents 900, as 'C' (100) placed before 'M' (1000) indicates subtraction. Similarly, 'XC' signifies 90, as 'X' (10) placed before 'C' (100) indicates subtraction. Therefore, by adding these values together, 1000 + 900 + 90, the total is 1990. Roman numerals follow specific rules for formation, including the subtractive principle where a smaller numeral preceding a larger one denotes subtraction, and the additive principle where numerals are generally added from left to right based on their value. MMCMX adheres to these established conventions.