Unit 6, Lesson 6
Percent Increase and Decrease with Equations
Accelerated 6
Preparation
Lesson Narrative
In this lesson, students use equations to represent situations involving percent increase and percent decrease. First, they match given equations to situations and solve the equations to find the unknown value. Next, they invent a situation to match a given equation. Then, students write equations to represent situations. They analyze the structure of the equations with attention to which number in the situation was unknown.
As students relate the situations with the equations, they reason quantitatively and abstractly (MP2).
- Explain (orally and in writing) how to calculate the original amount given the new amount and a percentage of increase or decrease.
- Generate algebraic expressions that represent a situation involving percent increase or decrease, and justify (orally) the reasoning.
Let’s use equations to represent increases and decreases.
Required Preparation
None