In today's modern conversion it is CMXC but the Romans themselves would have probably wrote it out simply as XM (-10+1000 = 990)
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990
In today's notation of Roman numerals 990 is equivalent to CMXC but the ancient Romans would have notated it quite differently.
990 = 1000 - 10 Hence in Roman numerals it is 'XM'. NB In Roman numerals the letter for the larger value ALWAYS goes to the left, except when subtracting a number. Whereupon the smaller value goes to the left followed by the larger value. M = 1000 D = 500 C = 100 L = 50 X = 10 V = 5 I = 1
In Roman numerals the number 77 is written as LXXVII.
1900 is written in Roman numerals as MCM.