Number
159 in Roman numerals
159 is written CLIX
Type any other number or numeral below to convert it.
Above 3,999? Type the barred part in brackets, e.g. (IV)CC = 4,200.
How CLIX is built
Roman numerals are written one decimal place at a time, largest first.
- Chundreds · 1C is 100.
- Ltens · 5L is 50.
- IXones · 9I before X means 10 − 1 = 9. This saves writing VIIII.
100 + 50 + 9 = 159
The pair IX uses subtraction: a smaller letter before a larger one is taken away from it. Only six pairs work this way: IV, IX, XL, XC, CD and CM. More on subtraction
Mistakes to avoid
- Not CLVIIII (7 letters). That adds everything up without subtraction. The Romans sometimes wrote numbers this way, and clocks still show 4 as IIII, but today CLIX (4 letters) is the standard.
About the number 159
- 159 is odd and can be split into prime factors: 3 × 53, or in Roman numerals III × LIII.
- CLIX has 4 letters. 784 of the numbers up to 1,000 have longer numerals.
Counting from 151 to 160
Every number from 151 to 160 starts CL (150); only the ending changes.
| Number | Roman numeral |
|---|---|
| 151 | CLI |
| 152 | CLII |
| 153 | CLIII |
| 154 | CLIV |
| 155 | CLV |
| 156 | CLVI |
| 157 | CLVII |
| 158 | CLVIII |
| 159 | CLIX |
| 160 | CLX |