In Roman numerals X = 10 and L = 50. The numeral XL (10 before 50) represents the number 40.
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The number 40 in Roman numerals is represented by XL.
40. L is 50. Putting the X behind the L means you subtract the 10 from the 50, and you get 40.
43
It is equal to forty, but would not have been written that way - it would have been written by the Romans as XL.
In Roman numerals, the number 40 is represented as "XL." The letter "X" represents 10, and "L" represents 50. When a smaller numeral appears before a larger one, it is subtracted from the larger numeral, so "XL" represents 50 - 10 = 40.