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In Roman numerals, the letter L represents 50, the letter X represents 10, and the letter I represents 1. Therefore, the Roman numeral LXIII represents L + X + I + I + I = 50 + 10 + 3 = 63.
However, XLIII = 43. When a lower value symbol appears to the left of a higher value symbol it is subtracted from that higher value. (X = 10 and L = 50; 50 - 10 = 40)
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