Roman Numeral — XLV (45) — free printable diagram

What is XLV in Roman numerals?

XLV is the Roman numeral for 45 — forty-five. Written the other way round, 45 in Roman numerals is XLV.

Roman numeral

XLV

Number

45

In words

forty-five

Symbols used

V = 5, X = 10, L = 50

Written as

XL (40) + V (5)

• XLV is built from XL (40) + V (5), which adds up to 45.
• XL uses the subtraction rule: a smaller symbol before a larger one is taken away, so X before L means 50 − 10 = 40.
• Roman numerals are read from left to right, adding each symbol as you go, except where the subtraction rule applies.