80 in Roman numerals
80 is written LXXX. In chunks: L (50) + X (10) + X (10) + X (10) = 80.
The answer
LXXX
80 in Roman numerals is LXXX.
How LXXX is built
To write it, 80 is 8 tens and no ones, so it is just the tens: LXXX. There is no zero to write.
To read it, LXXX has 4 chunks, and none of them is a take-away pair, so every chunk is added.
| Chunk | Worth | Why |
|---|---|---|
| L | 50 | Add |
| X | 10 | Add |
| X | 10 | Add |
| X | 10 | Add |
The mistake to watch for
Writing 80 as XXC
Wrong: XXC
XXC tries to take two X's away from C. Only one smaller letter can go in front of a bigger one, so 80 is LXXX (50 + 30).
Check it with the converter
Type XXC to see why XXC is not 80. The rule numbers it gives are the three rules on the Roman numerals page.
Converter set to LXXX (80).
Keep going
Questions parents ask
What is 80 in Roman numerals?
80 is LXXX.
What comes before and after LXXX?
79 is LXXIX and 81 is LXXXI. LXX stays at the front, and IX becomes X: LXXIX becomes LXXX.
Does LXXX use subtraction?
No. Every letter in LXXX is the same size as, or smaller than, the letter before it, so you just add them all.
What is the biggest letter in LXXX?
L, which is 50. LXXX has 4 letters.
Careful reading is an 11+ skill
Reading all 4 letters of LXXX in order is the careful checking 11+ papers reward. The free diagnostic covers all four subjects, with no card needed.