Lesson 12

Practice With Proportional Relationships

Lesson Narrative

This optional lesson gives students an additional opportunity to practice finding unknown values in proportional relationships using contextual examples. The problems preview using the Pythagorean Theorem, which is a key idea in a subsequent lesson. They also preview finding all unknown values in right triangles, which is a key idea in a subsequent unit. Students have a chance to reason abstractly and quantitatively as they think about whether their answers make sense in context (MP2).

Learning Goals

Teacher Facing

  • Calculate unknown values in proportional relationships.
  • Determine scale factors to describe similar figures (using words and other representations).

Student Facing

  • Let’s find unknown values in proportional relationships.

Learning Targets

Student Facing

  • I can find scale factors and use them to solve problems.

CCSS Standards


Print Formatted Materials

Teachers with a valid work email address can click here to register or sign in for free access to Cool Down, Teacher Guide, and PowerPoint materials.

Student Task Statements pdf docx
Cumulative Practice Problem Set pdf docx
Cool Down Log In
Teacher Guide Log In
Teacher Presentation Materials pdf docx
Blackline Masters zip

Additional Resources

Google Slides Log In
PowerPoint Slides Log In