3 in Roman numerals
3 is written III. In chunks: I (1) + I (1) + I (1) = 3.
The answer
III
3 in Roman numerals is III.
How III is built
To write it, 3 is less than 10, so there are no tens to write: 3 is III.
To read it, III has 3 chunks, and none of them is a take-away pair, so every chunk is added.
| Chunk | Worth | Why |
|---|---|---|
| I | 1 | Add |
| I | 1 | Add |
| I | 1 | Add |
The mistake to watch for
Miscounting the letters in III
III is three I's, all added together. One letter more or fewer makes a different number: II is 2.
Check it with the converter
Change the number 3 by one to see how its numeral changes. The rule numbers it gives are the three rules on the Roman numerals page.
Converter set to III (3).
Keep going
Questions parents ask
What is 3 in Roman numerals?
3 is III.
What comes before and after III?
2 is II and 4 is IV.
Does III use subtraction?
No. Every letter in III is the same size as, or smaller than, the letter before it, so you just add them all.
What is the biggest letter in III?
I, which is 1. III has 3 letters.
Where might you see III?
On clock faces, where the hours from I to XII go round the dial, and in the name of King Charles III.
When do children learn III?
In England, Year 3 children learn to tell the time on clocks with Roman numerals from I to XII, so III is one of the first numerals in the curriculum. Year 4 reads numerals to 100.
Want to practise more?
Explore the diagnostic for more practice activities.