I write comments on the exams and take off points where things are wrong or missing. I sometimes go over the whole exam quickly, but if everyone did well I just talk about the main items people missed. I encourage students to come see me to discuss questions they have about answers and grading. Sometimes if students did very poorly I'll give the whole class a chance to correct errors they made, by writing up each missed problem that they did wrong, and how to do it right. This is before telling them the answers!

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