420 in Words
How do you write 420 in words?
The number 420 is written four hundred twenty in words. As an ordinal it is four hundred twentieth, and on a check you would write Four hundred twenty and 00/100.
Last updated 24 August 2026
Other ways to write it
| Cardinal | four hundred twenty |
|---|---|
| Ordinal | four hundred twentieth |
| Currency | four hundred twenty dollars |
| Check format | Four hundred twenty and 00/100 |
How 420 is written
420 is the sum of its place values, 400 + 20, and is written four hundred twenty.
Its ordinal form is four hundred twentieth — only the final element takes the ordinal ending — and on a check the amount line reads "Four hundred twenty and 00/100", where 00/100 stands for zero cents.
British English inserts "and" before the last part, giving four hundred and twenty, where American English writes four hundred twenty without it.
Its Roman numeral CDXX uses subtractive notation: CD means 400, written as C before D instead of repeating C.
For house-style rules on spelling out numbers, see the Chicago Manual of Style.
Facts about 420
- 420 is an even number.
- It is not a prime number.
- Digit sum: 6.
- Roman numerals: CDXX.
- Binary: 110100100.
- Hexadecimal: 1A4.
| Digit | Place |
|---|---|
| 4 | hundreds |
| 2 | tens |
| 0 | ones |
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Frequently asked questions
How do you write 420 in words?
420 in words is "four hundred twenty".
How do you spell 420?
420 is spelled "four hundred twenty".
How do you write 420 on a check?
On a check, write "Four hundred twenty and 00/100".