ROMAN NUMERALS
The primary symbols are I = 1, V = 5, X = 10, L = 50, C = 100, D = 500, M = 1000. If a lesser symbol is placed to the right of a greater, its value is added to that of the greater, if it is placed to the left, its value is subtracted. Small subtractions from large values are avoided (e.g. 99 = XCIX and not IC). Roman numerals may appear in lower case (i, v, x, l, c, d, m), but the practice of printing e.g. viij for viii is now archaic. The sequences IIII, XXXX, CCCC, are occasionally used instead of the usual form (for example, on old clock faces).
Roman Decimal Roman Decimal
I 1 XXX 30
II 2 XL 40
III 3 XLIX 49
IV 4 L 50
V 5 LX 60
VI 6 LXX 70
VII 7 LXXX 80
VIII 8 XC 90
IX 9 XCIX 99
X 10 C 100
XI 11 CI 101
XII 12 CXLIV 144
XIII 13 CC 200
XIV 14 CD ( or CCCC ) 400
XV 15 D 500
XVI 16 CM ( or DCCCC ) 900
XVII 17 M 1000
XVIII 18 MCM ( or MDCCCC ) 1900
XIX 19 MCMXCV 1995
XX 20 MCMXCIX 1999
XXI 21 MM 2000

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