Lesson 12

Practice With Proportional Relationships

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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.

Required Materials

Learning Targets

Student Facing

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

CCSS Standards

Addressing

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Additional Resources

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