The values keep getting smaller—quickly! Pupils watch a video that contrasts exponential decay with exponential growth from the first lesson in the unit. Learners identify exponential functions that are decaying and create graphs of them. Scholars build upon their knowledge of percent increase problems to work percent decrease items that also include word problems. To finish, they use the problem set to practice their skills.

Concepts

exponential decay, exponential expressions, exponential functions, graphing functions, exponential models, percent decrease, exponential growth, growth and decay

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Instructional Ideas

• Lead a discussion about what happens if the base is negative

Classroom Considerations

• Assumes class members are familiar with percent increase
• Fits as the second lesson in an algebra unit with four parts

Pros

• Contains two extra worksheets for additional practice for individuals needing it
• Includes a practice wrap up to cement the concept

Cons

• None

Common Core

MP4 MP6 HSA-REI.D.10 HSF-IF.C.8.b