They are: X, L, M, XX and C respectively
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1 = i 10 = x 100 = c 1,000 = m
MDCCCXCI is in roman numerals. In normal numbers, it is:M = 1000, D = 500, C = 100, X = 10 and I = 1 so MDCCCXCI = 1000 + 500 + 100 + 100 + 100 + (100 - 10) + 1 = 1891.
I 1 V 5 X 10 L 50 C 100 D 500 M 1000
1000+100+100+10+10+9 = 1229
-1000,-10,-1,0,100