Typically, if it's after some lecture material, and if it's an interesting problem, students are working the problem, and I'm walking around the room and listening to what their problems are, what their misconceptions are. Many of them will take that opportunity to ask me a question about a misconception. I can then either stop and clarify for the whole class or I can just answer that question and move on to another group. When you do cooperative learning, you don't turn the students off and walk away. It's being part of the group and walking around, listening to what they're saying.

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