## Reflection: Adjustments to Practice Speaking of Spheres (Day 2) - Section 2: Activity

During the group work in this lesson, I realized I spent too much time with one or two groups. I judged that these groups needed help developing a method of finding the volume of their ball. I wanted to help them because the approach that they were taking required too much time, and, it was not likely to work. As a result, today my time assessing and guiding the other groups was rushed.

I would definitely set a time limit for myself of two to three minutes per group and begin with those that I expect will need my help most. Once these groups start, they work more independently. Two to three minutes gives me time to ask guided questions, to get a good sense of whether a student is engaged in the task and comprehends what is going on.

If everyone in a group can answer my questions, I make note of it and proceed. If a group wants to find the volume using another approach other than measuring the circumference of the ball, I hint by asking questions like:

• What do know about volume relationships with other figures?
• What is your goal here?
• Could you try a different approach that's less uncertain?

Timing myself in groupwork
Adjustments to Practice: Timing myself in groupwork

# Speaking of Spheres (Day 2)

Unit 10: Volumes of Cylinders, Cones, and Spheres
Lesson 5 of 7

## Big Idea: In cooperative groups students discuss and apply methods for determining the volume of a sports ball.

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Standards:
Subject(s):
Math, volume (3-D Geom), Geometry, circumference (Determining Measurements), volume of cube, Volume of spheres, Cooperative Groups
50 minutes

### Mauricio Beltre

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