1 in Words
How do you write 1 in words?
The number 1 is written one in words. As an ordinal it is first, and on a check you would write One and 00/100.
Last updated 19 June 2026
Other ways to write it
| Cardinal | one |
|---|---|
| Ordinal | first |
| Currency | one dollar |
| Check format | One and 00/100 |
How number-to-words spelling works
A cardinal number names a quantity (one), while an ordinal names a position (first). English hyphenates compound numbers from twenty-one to ninety-nine and groups digits into thousands, millions, and billions.
For house-style rules on spelling out numbers, see the Chicago Manual of Style, or read our guide to spelling numbers in words.
Facts about 1
- 1 is an odd number.
- It is not a prime number.
- Digit sum: 1.
- Roman numerals: I.
- Binary: 1.
- Hexadecimal: 1.
| Digit | Place |
|---|---|
| 1 | ones |
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Frequently asked questions
How do you write 1 in words?
1 in words is "one".
How do you spell 1?
1 is spelled "one".
How do you write 1 on a check?
On a check, write "One and 00/100".