The modern numeral for IX is 9.
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9 in Roman numerals is written as IX.
In Roman numerals I = 1 and X = 10. The numeral IX represents 1 before 10, which is 9.
It is 911. IX = 9 XI = 11
109. (c = 100, ix = 9)
In todays modern configuration of Roman numerals: IX-XV-MCMLXVII