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by signal11 3890 days ago
I think the meta-lesson for the child is that there'll always be people like the teacher who marked "5+5+5" wrong and this guy who defends it with bullshit reasoning, and part of learning to deal with the world involves learning that sometimes one can be absolutely right and still be penalised/marked wrong/disagreed with, and you have to deal with that, sometimes by just answering the way they expect you to answer.

It's a pretty rough lesson to learn during a math test, though. :-\