### Roman Numerals - For Competitive Exams

• A letter repeated once or twice repeats its value that many times (XXX = 30, CC = 200, etc.).
• One or more letters placed after another letter of greater value increases the greater value by the amount of the smaller (VI = 6, LXX = 70, MCC = 1200, etc.).
• A letter placed before another letter of greater value decreases the greater value by the amount of the smaller (IV = 4, XC = 90, CM = 900, etc.). Several rules apply for subtraction: (a) only subtract powers of ten (I, X, or C, but not V or L); (b) only subtract one number from another; (c) do not subtract a number from one that is more than 10 times greater (that is, you can subtract 1 from 10 [IX] but not from 20—there is no such number as IXX).
• A bar placed on top of a letter or string of letters increases the numeral's value by 1,000 times (XV = 15,  = 15,000).

 Letter Value I 1 II 2 III 3 IV 4 V 5 VI 6 VII 7 VIII 8 IX 9 X 10 XX 20 XXX 30 XL 40 L 50 LX 60 LXX 70 LXXX 80 XC 90 C 100 D 500 M 1,000 5,000 10,000 50,000 100,000 500,000 1,000,000