11 in Roman numerals
11 is written XI. In chunks: X (10) + I (1) = 11.
The answer
XI
11 in Roman numerals is XI.
How XI is built
To write it, split 11 into 10 + 1. 10 is X, 1 is I, so 11 is X then I: XI.
To read it, XI has 2 chunks, and none of them is a take-away pair, so every chunk is added.
| Chunk | Worth | Why |
|---|---|---|
| X | 10 | Add |
| I | 1 | Add |
The mistake to watch for
Writing 11 as IX
Wrong: IX
IX has the same letters in a different order, and order matters. A smaller letter before a bigger one means take away, so IX is 9, not 11. 11 is XI.
Check it with the converter
Type IX to see why IX is not 11. The rule numbers it gives are the three rules on the Roman numerals page.
Converter set to XI (11).
Keep going
Questions parents ask
What is 11 in Roman numerals?
11 is XI.
What comes before and after XI?
10 is X and 12 is XII.
Does XI use subtraction?
No. Every letter in XI is the same size as, or smaller than, the letter before it, so you just add them all.
What is the biggest letter in XI?
X, which is 10. XI has 2 letters.
Where might you see XI?
On clock faces, where the hours from I to XII go round the dial.
When do children learn XI?
In England, Year 3 children learn to tell the time on clocks with Roman numerals from I to XII, so XI 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.