40 in Roman numerals is XL
The Arabic number 40 is written as XL in Roman numerals. Below you can see the parts it is built from.
40 in Roman numerals
XL
How is {n} written in Roman numerals?
Roman numerals run from the largest value to the smallest: XL = 40. In total XL = 40. A smaller symbol before a larger one means subtraction (IV = 4, IX = 9, XL = 40, CM = 900). Roman numerals cover numbers 1-3999.