XLV
40 + 5 = 45
XLV breaks down as XL + V (XL = 40, V = 5), which add up to 45. It uses subtractive notation: XL (50 - 10).
XLV breaks down as XL + V (XL = 40, V = 5), which add up to 45. It uses subtractive notation: XL (50 - 10).
The number 45 is written XLV in Roman numerals. Roman numerals use seven letters — I (1), V (5), X (10), L (50), C (100), D (500) and M (1000) — combined from largest to smallest, with subtractive pairs such as IV (4) and IX (9). Need another number? Use the Roman numeral converter or see the 1–100 chart.