540 in Roman numerals

540 in Roman numerals is DXL.

Pick any whole number from 1 to 3,999.

540 = \text{DXL}

How to work it out

1
Take the biggest Roman value that fits, write its letter, subtract it, and repeat.
2
Here: 500 (D) + 40 (XL) = 540.
3
Joined together: DXL. (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.)

Value	Letters
500	D
40	XL

What is 540 in Roman numerals?

DXL.

How do you read DXL?

DXL = 500 + 40 = 540.