43 in Roman numerals
43 is written XLIII. In chunks: XL (40) + I (1) + I (1) + I (1) = 43.
The answer
XLIII
43 in Roman numerals is XLIII.
How XLIII is built
To write it, split 43 into 40 + 3. 40 is XL, 3 is III, so 43 is XL then III: XLIII.
To read it, XLIII has 4 chunks, and XL is a take-away pair, worked out first and then added.
| Chunk | Worth | Why |
|---|---|---|
| XL | 40 | X before L: take away |
| I | 1 | Add |
| I | 1 | Add |
| I | 1 | Add |
The mistake to watch for
Writing 43 as XXXXIII
Wrong: XXXXIII
XXXXIII writes X four times in a row. Never more than three: 40 is XL, ten before fifty, which makes 43 XLIII.
Check it with the converter
Type XXXXIII to see why XXXXIII is not 43. The rule numbers it gives are the three rules on the Roman numerals page.
Converter set to XLIII (43).
Keep going
Questions parents ask
What is 43 in Roman numerals?
43 is XLIII.
What comes before and after XLIII?
42 is XLII and 44 is XLIV.
Does XLIII use subtraction?
Yes, once: X comes before the bigger L, so XL is 40. The other letters are added.
What is the biggest letter in XLIII?
L, which is 50. XLIII has 5 letters.
Careful reading is an 11+ skill
Reading all 5 letters of XLIII in order is the careful checking 11+ papers reward. The free diagnostic covers all four subjects, with no card needed.