15 in Roman numerals

15 in Roman numerals is XV.

Pick any whole number from 1 to 3,999.

15 = \text{XV}

How to work it out

1
Take the biggest Roman value that fits, write its letter, subtract it, and repeat.
2
Here: 10 (X) + 5 (V) = 15.
3
Joined together: XV. (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
10	X
5	V

What is 15 in Roman numerals?

XV.

How do you read XV?

XV = 10 + 5 = 15.