How to write 159 in Roman numerals
Roman numerals are built place by place, from the largest value to the smallest. For 159 the places are 100 (hundreds), 50 (tens), 9 (ones).
- Write 100 as
C. - Write 50 as
L. - Write 9 as
IX.
Joined together, C + L + IX gives CLIX.
159 digit by digit
| Place | Value | Numeral | Rule used |
|---|---|---|---|
| hundreds | 100 | C | one symbol |
| tens | 50 | L | the five symbol on its own |
| ones | 9 | IX | subtractive: one symbol before the ten symbol |
Check CLIX by reading it back
Reading CLIX from left to right and adding the pieces: C = 100, L = 50, IX = 9. Together that is 100 + 50 + 9 = 159, so CLIX and 159 match.
Mistakes to avoid with CLIX
- Do not write the 4s and 9s additively. 159 uses subtractive pairs (
IXfor 9), not strings like IIII or VIIII. - Only I, X and C may be placed before a larger symbol to subtract, so CLIX never contains forms such as VX or LC.
- Read CLIX as one number, not letter by letter: add the values left to right, except where a smaller symbol sits before a larger one.
Facts about the number 159
- 159 is an odd number and composite, with prime factors 3 x 53.
- In binary 159 is
10011111and in hexadecimal it is9F. - Written out, 159 is "one hundred fifty-nine".
- The digits of 159 add up to 15, so it is divisible by 3.
Where you will see 159 in Roman numerals
The numeral CLIX represents 159 in the introductory pages of extensive scholarly publications or formal proceedings. Organizations keep Roman numerals for front matter to uphold traditional publishing standards and separate early pages from the main document.
Numbers near 159
| Number | Roman numeral |
|---|---|
| 157 | CLVII |
| 158 | CLVIII |
| 159 | CLIX |
| 160 | CLX |
| 161 | CLXI |
FAQ
What is 159 in Roman numerals?
159 is written CLIX in Roman numerals. It is built from C (100), L (50), IX (9).
How do you write 159 in lowercase Roman numerals?
Lowercase Roman numerals use the same rules, so 159 is clix. Lowercase is common for page numbers in a book's preface and for outline levels.
How do I convert any number to Roman numerals?
Split the number into thousands, hundreds, tens and ones, write each part with the symbols I, V, X, L, C, D and M, then join them from largest to smallest. Or paste it into the Roman numeral converter, which also converts back.
More roman numerals
- 156 (CLVI): previous page
- 160 (CLX): next page
- Roman numerals chart: the full list