40 in Roman numerals

40 in Roman numerals is XL.

Pick any whole number from 1 to 3,999.

40 = \text{XL}

How to work it out

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

What is 40 in Roman numerals?

XL.

How do you read XL?

XL = 40 = 40.