How to write 155 in Roman numerals
Roman numerals are built place by place, from the largest value to the smallest. For 155 the places are 100 (hundreds), 50 (tens), 5 (ones).
- Write 100 as
C. - Write 50 as
L. - Write 5 as
V.
Joined together, C + L + V gives CLV.
155 digit by digit
| Place | Value | Numeral | Rule used |
|---|---|---|---|
| hundreds | 100 | C | one symbol |
| tens | 50 | L | the five symbol on its own |
| ones | 5 | V | the five symbol on its own |
Check CLV by reading it back
Reading CLV from left to right and adding the pieces: C = 100, L = 50, V = 5. Together that is 100 + 50 + 5 = 155, so CLV and 155 match.
Mistakes to avoid with CLV
- Only I, X and C may be placed before a larger symbol to subtract, so CLV never contains forms such as VX or LC.
- Read CLV 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 155
- 155 is an odd number and composite, with prime factors 5 x 31.
- In binary 155 is
10011011and in hexadecimal it is9B. - Written out, 155 is "one hundred fifty-five".
- The digits of 155 add up to 11.
Where you will see 155 in Roman numerals
The number 155 is expressed as CLV in the opening pages of exceptionally long printed directories or encyclopedias. Editors choose Roman numerals for front matter so readers immediately recognize they have not yet reached the main entries.
Numbers near 155
FAQ
What is 155 in Roman numerals?
155 is written CLV in Roman numerals. It is built from C (100), L (50), V (5).
How do you write 155 in lowercase Roman numerals?
Lowercase Roman numerals use the same rules, so 155 is clv. 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
- 154 (CLIV): previous page
- 156 (CLVI): next page
- Roman numerals chart: the full list