# Lesson 7

Revisit Percentages

### Lesson Narrative

Students learned about what percentages are and how to solve certain problems in an earlier unit. At the time, they did not learn an efficient procedure for finding $$B$$ in “$$A\%$$ of $$B$$ is $$C$$” given $$A$$ and $$C$$, because they didn't have an efficient way to solve an equation of the form $$px=q$$. Now they do, so we briefly revisit this type of problem.

### Learning Goals

Teacher Facing

• State explicitly what the chosen variable represents when creating an equation.
• Use equations to solve problems involving percentages and explain (orally) the solution method.
• Write equations of the form $px=q$ or equivalent to represent situations where the amount that corresponds to 100% is unknown.

### Student Facing

Let's use equations to find percentages.

### Student Facing

• I can solve percent problems by writing and solving an equation.

Building On