XI
Roman numeral tutorial:
Roman numerals are governed by a few simple rules: First that each 1 and 5 interval (1, 5, 10, 50, 100, etc) has its own letter (number) for it. The number for 1 is I, and at first it's basically just tally marks: 1(I) 2(II) 3(III) but the number for 5 is V, and another rule is that if you are one before an interval (4, 9, 14, 19, etc) you put a I before the next number. Based on this, 1 before 5, or 4 is shown as IV. Then it continues as regular with a I added to V. V(5) VI(6) VII(7) VIII(8) and then the numeral for 10 is X, so IX(9) X(10) XI(11) XII(12) XIII(13) XIV(14) XV(15) XVI(16) XVII(17) XVIII(18) XIX(19) XX(20) and you put larger numbers before others, so XXI(21) XXII(22) XXIII(23) XXIV(24) XXV(25) XXVI(26) XXVII(27) XXVIII(28) XXIX(29) XXX(30) XXXI(31) XXXII(32) XXXIII(33) XXXIV(34) XXXV(35) XXXVI(36) XXXVII(37) XXXVIII(38) XXXIX(39) and the same rules work for larger numbers. 50 is L, so 10 before 50 (40) would be shown as XL. Beyond that, you get the idea. XL(40) XLI(41) XLII(42) XLIII(43) XLIV(44) XLV(45) XLVI(46) XLVII(47) XLVIII(48) XLIX(49) L(50)
1: I
5: V
10: X
50: L
100: C
500: D
1000: M/
I5000:
V10000:
X50000:
L100000:
C... and so on.
quiz: What are the numbers?
XIX
LXXI
CXCVII
DCLXXVIII