There is no Roman Numeral value for this particular set.

111 (one hundred eleven) is CXI in Roman Numerals and the Roman Numeral X is equivalent to 10.

There are four basic principles for reading and writing Roman numerals:

**1.** A letter repeats its value that many times (XXX = 30, CC = 200, etc.). A letter can only be repeated three times.

**2.** If one or more letters are placed after another letter of greater value, add that amount.

## VI = 6 (5 + 1 = 6)

## LXX = 70 (50 + 10 + 10 = 70)

## MCC = 1200 (1000 + 100 + 100 = 1200)

**3.** If a letter is placed before another letter of greater value, subtract that amount.

## IV = 4 (5 – 1 = 4)

## XC = 90 (100 – 10 = 90)

## CM = 900 (1000 – 100 = 900)

Several rules apply for subtracting amounts from Roman numerals:

a. Only subtract powers of ten (I, X, or C, but not V or L)

## For 95, do NOT write VC (100 – 5).

## DO write XCV (XC + V or 90 + 5)

b. Only subtract one number from another.

## For 13, do NOT write IIXV (15 – 1 - 1).

## DO write XIII (X + I + I + I or 10 + 3)

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 1 from 20—there is no such number as IXX.)

## For 99, do NOT write IC (C – I or 100 - 1).

## DO write XCIX (XC + IX or 90 + 9)

**4.** A bar placed on top of a letter or string of letters increases the numeral's value by 1,000 times.

## XV = 15, (x̅ y̅) = 15,000