840 in Words
How do you write 840 in words?
The number 840 is written eight hundred forty in words. As an ordinal it is eight hundred fortieth, and on a check you would write Eight hundred forty and 00/100.
Last updated 19 June 2026
Other ways to write it
| Cardinal | eight hundred forty |
|---|---|
| Ordinal | eight hundred fortieth |
| Currency | eight hundred forty dollars |
| Check format | Eight hundred forty and 00/100 |
How number-to-words spelling works
A cardinal number names a quantity (eight hundred forty), while an ordinal names a position (eight hundred fortieth). 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 840
- 840 is an even number.
- It is not a prime number.
- Digit sum: 12.
- Roman numerals: DCCCXL.
- Binary: 1101001000.
- Hexadecimal: 348.
| Digit | Place |
|---|---|
| 8 | hundreds |
| 4 | tens |
| 0 | ones |
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Frequently asked questions
How do you write 840 in words?
840 in words is "eight hundred forty".
How do you spell 840?
840 is spelled "eight hundred forty".
How do you write 840 on a check?
On a check, write "Eight hundred forty and 00/100".