How to write 101 in Roman numerals
Roman numerals are built place by place, from the largest value to the smallest. For 101 the places are 100 (hundreds), 1 (ones).
- Write 100 as
C. - Write 1 as
I.
Joined together, C + I gives CI.
101 digit by digit
| Place | Value | Numeral | Rule used |
|---|---|---|---|
| hundreds | 100 | C | one symbol |
| ones | 1 | I | one symbol |
Check CI by reading it back
Reading CI from left to right and adding the pieces: C = 100, I = 1. Together that is 100 + 1 = 101, so CI and 101 match.
Mistakes to avoid with CI
- Only I, X and C may be placed before a larger symbol to subtract, so CI never contains forms such as VX or LC.
- Read CI 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 101
- 101 is an odd number and a prime number.
- In binary 101 is
1100101and in hexadecimal it is65. - Written out, 101 is "one hundred one".
- The digits of 101 add up to 2.
Where you will see 101 in Roman numerals
A movie sequel reaching installment 101 would display its title with the numeral CI. Filmmakers use Roman numerals for high sequence numbers to preserve franchise branding consistency, even though such large counts remain purely hypothetical today.
Numbers near 101
FAQ
What is 101 in Roman numerals?
101 is written CI in Roman numerals. It is built from C (100), I (1).
How do you write 101 in lowercase Roman numerals?
Lowercase Roman numerals use the same rules, so 101 is ci. 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
- 100 (C): previous page
- 102 (CII): next page
- Roman numerals chart: the full list