Online Tools Harbor30 in every format
| In words | thirty |
|---|---|
| Uppercase | THIRTY |
| On a check (cheque) | Thirty dollars and 00/100 |
| Ordinal | 30th · thirtieth |
| Roman numerals | XXX |
| US / UK format | 30 |
| European format | 30 |
| Scientific notation | 3 × 10^1 |
| Binary | 11110 |
| Hexadecimal | 1E |
| Even / odd | Even · not prime |
Frequently asked questions
How do you write 30 in words?
30 is written as "thirty".
How do you write 30 on a check?
Write "Thirty dollars and 00/100" on the amount line and 30.00 in the box.
What is 30 in Roman numerals?
30 in Roman numerals is XXX.
What is the ordinal of 30?
The ordinal form is 30th ("thirtieth").
Spell out any number with the Number to Words Converter, or convert to Roman numerals with the Roman Numeral Converter.