Changing Scales

Pupils determine scale factors from one figure to another and the scale factor in the reverse direction. Scholars compute the percent changes between three figures. 

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CCSS: Designed
Instructional Ideas

  • Lead a discussion on how to figure out scale factors when only given percentages
  • Give the class the scale factor as a percent and ask them to draw two images that represent the scale factor
Classroom Considerations

  • Learners should be familiar with finding scale factors
  • 14th installment in a 20-part series
Pros

  • The answer keys show the arithmetic steps needed to arrive at the solution
  • Highlights the places where the mathematical practices are used within the lesson
Cons

  • None