Lesson objective: Use equations to solve problems involving percent error.

This lesson helps to build procedural skills with percent error. Equations are used here because they help students make sense of the complex relationships between the various values. This work develops students' understanding that equations can be used to solve problems involving percents.

Students engage in Mathematical Practice 1 (make sense and persevere in solving problems) as they use equations to make sense of the complex relationships between the values in problems involving percent error.

**Key vocabulary:**

- percent error
- percent
- equation
- equivalent decimal
- equivalent fraction