28 in Roman numerals
28 is written XXVIII. In chunks: X (10) + X (10) + V (5) + I (1) + I (1) + I (1) = 28.
The answer
XXVIII
28 in Roman numerals is XXVIII.
How XXVIII is built
To write it, split 28 into 20 + 8. 20 is XX, 8 is VIII, so 28 is XX then VIII: XXVIII.
To read it, XXVIII has 6 chunks, and none of them is a take-away pair, so every chunk is added.
| Chunk | Worth | Why |
|---|---|---|
| X | 10 | Add |
| X | 10 | Add |
| V | 5 | Add |
| I | 1 | Add |
| I | 1 | Add |
| I | 1 | Add |
The mistake to watch for
Writing 28 as XXIIX
Wrong: XXIIX
XXIIX tries to take two I's away from X. Only one smaller letter can go in front of a bigger one, so 8 is VIII (5 + 3), which makes 28 XXVIII.
Check it with the converter
Type XXIIX to see why XXIIX is not 28. The rule numbers it gives are the three rules on the Roman numerals page.
Converter set to XXVIII (28).
Keep going
Questions parents ask
What is 28 in Roman numerals?
28 is XXVIII.
What comes before and after XXVIII?
27 is XXVII and 29 is XXIX.
Does XXVIII use subtraction?
No. Every letter in XXVIII is the same size as, or smaller than, the letter before it, so you just add them all.
What is the biggest letter in XXVIII?
X, which is 10. XXVIII has 6 letters.
Careful reading is an 11+ skill
Reading all 6 letters of XXVIII in order is the careful checking 11+ papers reward. The free diagnostic covers all four subjects, with no card needed.