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My first inclination would be to write it the same way it's written in school materials. If the course catalog or class schedule says "Algebra 2", that's what I'd write. I'd do something different...
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#3: Attribution notice added
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#2: Initial revision
My first inclination would be to write it the same way it's written in school materials. If the course catalog or class schedule says "Algebra 2", that's what I'd write. I'd do something different if there was potential for confusion. Like to take a contrived example, if there was a class call "Medical IV", there might be confusion whether "IV" is intended to be Roman numeral 4 or the abbreviation for "intravenous". But that's really stretching things to find a problem, I think. I wouldn't write it out, like "Algebra Two", unless the pronunciation was important to the story. Like if it's important for some reason that a character said "one-oh-one" rather than "one hundred one", then I'd spell it out. If it doesn't matter, I'd stick to the more conventional way to write it.