Touma isn't
that bad at math. In vol.20 he was measuring Russia's countryside with some 1m lengths of string. Plus, didn't Komoe-sensei pretty much allude to his intelligence in NT vol.2 in response to his absences.?
Quote:
“Whether you are smart or not, you are going to get bad grades on your tests if you never even take in the fundamental knowledge. I doubt he has just been sleeping this whole time, so something must have been entering his head in place of his lessons… Just what could be filling Kamijou-chan’s head?”
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He's just damn lazy outside of life and death situations (who would be?)...and is horrible with languages.