In Roman Numerals, what does XL equate to?

XL equals 40 because Roman numerals use subtractive notation: when a smaller numeral comes before a larger one, you subtract it. Here, X is 10 and L is 50, so XL = 50 − 10 = 40. By contrast, if the smaller numeral follows the larger one, you add (e.g., LX = 60). Roman numerals originated in ancient Rome and still appear on clocks, book chapters, and events like the Super Bowl. A handy memory trick: think “X Less than L” (XL = L minus X). Also, while XL on clothing means “extra large,” in numerals it ironically means “10 less than L,” reinforcing that the X in front reduces the value.