340 in Roman numerals

340 in Roman numerals is CCCXL.

Pick any whole number from 1 to 3,999.

340 = \text{CCCXL}

How to work it out

1
Take the biggest Roman value that fits, write its letter, subtract it, and repeat.
2
Here: 100 (C) + 100 (C) + 100 (C) + 40 (XL) = 340.
3
Joined together: CCCXL. (Four of the same letter in a row is never used: 4 is IV, 9 is IX, 40 is XL, 90 is XC, 400 is CD, 900 is CM.)

What is 340 in Roman numerals?

CCCXL.

How do you read CCCXL?

CCCXL = 100 + 100 + 100 + 40 = 340.