How to write 100 in Roman numerals
Roman numerals are built place by place, from the largest value to the smallest. For 100 the places are 100 (hundreds).
- Write 100 as
C.
Joined together, C gives C.
100 digit by digit
| Place | Value | Numeral | Rule used |
|---|---|---|---|
| hundreds | 100 | C | one symbol |
Check C by reading it back
Reading C from left to right and adding the pieces: C = 100. Together that is 100, so C and 100 match.
Mistakes to avoid with C
- Only I, X and C may be placed before a larger symbol to subtract, so C never contains forms such as VX or LC.
- Read C 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 100
- 100 is an even number and composite, with prime factors 22 x 52.
- In binary 100 is
1100100and in hexadecimal it is64. - Written out, 100 is "one hundred".
- The digits of 100 add up to 1.
- 100 is a perfect square (10 x 10).
Where you will see 100 in Roman numerals
Centuries are frequently named using Roman numerals, so the one hundredth century would be written as C. Historians prefer this format for the number 100 because it aligns with traditional academic conventions for denoting broad historical eras.
Numbers near 100
FAQ
What is 100 in Roman numerals?
100 is written C in Roman numerals. It is built from C (100).
How do you write 100 in lowercase Roman numerals?
Lowercase Roman numerals use the same rules, so 100 is c. 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
- 99 (XCIX): previous page
- 101 (CI): next page
- Roman numerals chart: the full list