How to Read Roman Numbers and Convert from Arabic to Roman?
The Roman numerals are represented by the following letters:
- I = 1
- V = 5
- X = 10
- L = 50
- C = 100
- D = 500
- M = 1000
If a numeral is followed by another numeral of lower denomination, the two are added together. If it is preceded by one of lower denomination, the smaller numeral is subtracted from the greater.
Thus XI = 11 (X + I), but IX = 9 (X – I).
Other examples are XXC = 80, CXL = 140, XV = 15, XLVIII = 48.
Thousands from 1000 to 9000 are represented as M, MM, MMM, MMMM, MMMMM, MMMMMM, MMMMMMM, MMMMMMMM, MMMMMMMMM.
Multiples of a thousand are also/alternatively indicated by a superior bar: thus, V̅ = 5000, V̅I̅ = 6000, V̅I̅I̅ = 7000, ... , X̅ = 10000, X̅X̅D̅ = 480000, etc.
How to read a Roman Numeral?
Break the number into Thousands, Hundreds, Tens, and Units and write down each in turn.
Example: Convert 2241 to Roman Numerals.
Break 2241 into 2000, 200, 40, and 1, then do each conversion
2000 = MM
200 = CC
40 = XL
1 = I
So, 2241 = MMCCXLI
Roman to Arabic Numerals Chart Hundreds
| C | 100 | One hundred |
| CC | 200 | Two hundred |
| CCC | 300 | Three hundred |
| CD | 400 | Four hundred |
| D | 500 | Five hundred |
| DC | 600 | Six hundred |
| DCC | 700 | Seven hundred |
| DCCC | 800 | Eight hundred |
| CM | 900 | Nine hundred |
Roman to Arabic Numerals Chart (Thousands)
| M | 1000 | One thousand |
| MM | 2000 | Two thousand |
| MMM | 3000 | Three thousand |
| MMMMM | 4000 | Four thousand |
| MMMMM | 5000 | Five thousand |
| MMMMMM | 6000 | Six thousand |
Roman to Arabic numerals from 1 to 100 by Tens
| X | 10 |
| XX | 20 |
| XXX | 30 |
| XL | 40 |
| L | 50 |
| LX | 60 |
| LXX | 70 |
| LXXX | 80 |
| XC | 90 |
| C | 100 |