17 in Roman numerals
17 is written XVII. In chunks: X (10) + V (5) + I (1) + I (1) = 17.
The answer
XVII
17 in Roman numerals is XVII.
How XVII is built
To write it, split 17 into 10 + 7. 10 is X, 7 is VII, so 17 is X then VII: XVII.
To read it, XVII has 4 chunks, and none of them is a take-away pair, so every chunk is added.
| Chunk | Worth | Why |
|---|---|---|
| X | 10 | Add |
| V | 5 | Add |
| I | 1 | Add |
| I | 1 | Add |
The mistake to watch for
Writing 17 as XIIIIIII
Wrong: XIIIIIII
XIIIIIII counts in ones, like a tally, and writes I more than three times in a row. Use V for five: 7 is VII, which makes 17 XVII.
Check it with the converter
Type XIIIIIII to see why XIIIIIII is not 17. The rule numbers it gives are the three rules on the Roman numerals page.
Converter set to XVII (17).
Keep going
Questions parents ask
What is 17 in Roman numerals?
17 is XVII.
What comes before and after XVII?
16 is XVI and 18 is XVIII.
Does XVII use subtraction?
No. Every letter in XVII is the same size as, or smaller than, the letter before it, so you just add them all.
What is the biggest letter in XVII?
X, which is 10. XVII has 4 letters.
Careful reading is an 11+ skill
Reading all 4 letters of XVII in order is the careful checking 11+ papers reward. The free diagnostic covers all four subjects, with no card needed.