12 in Roman numerals
12 is written XII. In chunks: X (10) + I (1) + I (1) = 12.
The answer
XII
12 in Roman numerals is XII.
How XII is built
To write it, split 12 into 10 + 2. 10 is X, 2 is II, so 12 is X then II: XII.
To read it, XII has 3 chunks, and none of them is a take-away pair, so every chunk is added.
| Chunk | Worth | Why |
|---|---|---|
| X | 10 | Add |
| I | 1 | Add |
| I | 1 | Add |
The mistake to watch for
Miscounting the letters in XII
XII is one X then two I's, all added together. One letter more or fewer makes a different number: XI is 11 and XIII is 13.
Check it with the converter
Change XII by one letter to see which number you get. The rule numbers it gives are the three rules on the Roman numerals page.
Converter set to XII (12).
Keep going
Questions parents ask
What is 12 in Roman numerals?
12 is XII.
What comes before and after XII?
11 is XI and 13 is XIII.
Does XII use subtraction?
No. Every letter in XII is the same size as, or smaller than, the letter before it, so you just add them all.
What is the biggest letter in XII?
X, which is 10. XII has 3 letters.
Where might you see XII?
On clock faces, where the hours from I to XII go round the dial, at the very top.
When do children learn XII?
In Year 3. The national curriculum has Year 3 children tell the time on clocks with Roman numerals from I to XII, so XII is one of the first numerals they meet. Year 4 then reads numerals to 100.
Careful reading is an 11+ skill
Reading all 3 letters of XII in order is the careful checking 11+ papers reward. The free diagnostic covers all four subjects, with no card needed.