Here is a recording of part of a lesson with a group of 5 students trying to solve addition and subtraction problems involving negatives:

There are four clips here:

In this short clip a student surprises me by asking me how I see the problem. Why was I so surprised at this question?

Leila starts this clip by saying "I have no opinion."

What do you think about the way I continued this conversation?

In this long clip students are trying to solve

What do you think about the way I handle the students' responses? How would you have handled this discussion differently?

In this clip, Leila is trying to answer the calculation

What is interesting about this clip to you?

**Clip 1: 0:00 - 0:05***"So how do you see it?"*In this short clip a student surprises me by asking me how I see the problem. Why was I so surprised at this question?

**Clip 2: 0:06 - 0:21***"Who is going to unconfuse Leila?"*Leila starts this clip by saying "I have no opinion."

What do you think about the way I continued this conversation?

**Clip 3: 0:23 - 5:02***"So we've got three different answers at the moment..."*In this long clip students are trying to solve

**(-5) - (-2)**. I start by writing each student's answer on the board, and then I try to encourage students to explain their reasoning.What do you think about the way I handle the students' responses? How would you have handled this discussion differently?

**Clip 4: 5:04 - 6:03***"What do you think?"*In this clip, Leila is trying to answer the calculation

**3 - (-8)**. At one point Serota turns to Leila and asks her, "What do you think? Explain how/why you got..."What is interesting about this clip to you?