You'll see a lot of Roman Numerals in Chemistry. When namingcompounds, you'll need to know the difference between Iron (IV)Carbonate and Iron (II) Carbonate, for example.In plays, often acts and scenes are organized with RomanNumerals. (Act III, Scene I).And, in all honesty, lots of people will use Roman Numerals justto make something look fancier. Its typically a good idea to knowat least the first five roman numerals off the top of yourhead.