Proportions Lesson 7 Episode 3 (Teachers)


Download Math TaskLink to Geogebra applet Link to on-line calculator

Christopher and Kate draw a diagram to find the amount of white paint to mix with a given amount of red paint to match a certain shade of pink. They develop a new way to think about the problem by forming a multiplicative comparison between the amount of white and red paint in a batch of paint.

Episode Supports

Focus Questions

For use in a classroom, pause the video and ask these questions:

1. [Pause video at 1:20] Can someone revoice Kate’s strategy? Who think it will work? Who thinks it will not work?

2. [Pause video at 2:52] Can someone revoice Kate’s idea about 3 fitting into there? 3 what into what? Can you come up to the video display to show what you mean?

Supporting Dialogue

Allow students the opportunity to revoice others’ ideas by asking students to:

1. Stop the video at 4:20. Ask students to talk to a neighbor about Kate and Christopher’s idea, striving for precise language. Invite the students to prepare their observations to share with the class.

2. When students share, ask another student to revoice what they heard by asking: Who can revoice what Natalie just shared?