18 in words
British English
eighteen
Eighteen has one t, like eighth.
Quick reference
- In figures
- 18
- British English
- eighteen
- American English
- The same (why they differ)
- Ordinal
- eighteenth (18th)
- Roman numeral
- XVIII
- Place value
- 1 in the tens column; 8 in the ones column
- Expanded form
- 10 + 8
- Standard form
- 1.8 × 10¹
- Even or odd
- Even
- Prime factors
- 2 × 3²
Convert any other number, up to thirty-six digits.