Page 141 - LZ-IM_FL_Grade 7_Print Sample

4.3 Activity Prep
Card 15 of 31
Teaching notes
Let's do an activity about constant speed.
First, you will complete the missing information in a table about time, distance, and speed.
Then you will think about equations that could represent the relationships in the table.
Finally, we will come together as a class to discuss our strategies and solutions.
Pacing: 10 minutes for entire activity
This entire activity spans 6 cards. This is card 1 of 6.
Instructional routines:
Anticipate, Monitor, Select, Sequence, Connect MLR5: Co-Craft Questions and Problems
Activity narrative
This activity revisits a context seen previously.
This time, students represent the proportional relationship between distance and time with an equation.
Students once again make use of structure (MP7) and use repeated reasoning (MP8), but there is also a focus on moving back and forth between the abstract representation and the context (MP2).
As part of this activity, students calculate distance and speed.
Students should know from grade 6 that speed is the quotient of distance traveled by amount of time elapsed, so they can divide 915 by 1.5 to get the speed.
Students that do not begin the problem in that way can be directed back to the similar task in previous lessons to make connections and correct themselves.
Once students have the speed, which is constant throughout this problem, they identify this as the constant of proportionality and use it to nd the missing values.
Monitor for students who solve the problem in di erent ways.
Use this monitoring sheet to anticipate and track the approaches students use and to select which students you will call on to share their strategy during the activity synthesis.
Are you ready for more?
An extension problem is available for this activity.
Find the problem in the Additional Materials section of this lesson.