XLIX
40 + 9 = 49
XLIX breaks down as XL + IX (XL = 40, IX = 9), which add up to 49. It uses subtractive notation: IX (10 - 1), XL (50 - 10).
XLIX breaks down as XL + IX (XL = 40, IX = 9), which add up to 49. It uses subtractive notation: IX (10 - 1), XL (50 - 10).
The number 49 is written XLIX 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.