The Unit Rate as the Scale Factor

Discover the scale factor by finding the constant of proportionality. Pupils investigate drawings to determine whether the distances are proportional. The lesson defines the scale factor to the the constant of proportionality, unit rate, of proportional lengths. The class uses the information to find scale factors and lengths in the 17th section in a series of 22.

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CCSS: Designed
Instructional Ideas

  • Provide drawings that are not true scale drawings and have the class explain why
  • Create a museum walk of the scale drawings in the extension
Classroom Considerations

  • The class should be comfortable with finding the constant of proportionality
Pros

  • Helps guide instruction with scripted lesson plans
  • Includes scaffolding suggestions to challenge the class
Cons

  • None
Common Core