Find an easier way to double it. Using the price of an item and the Consumer Price Index, learners determine how long it will be for the price to double. Scholars calculate the length of time it would take for the price to double using a different percentage. They then compare the Rule of 72 to the calculated times and compare all of the representations.

Concepts

exponential equations, exponential functions, exponential growth, exponential models, functions, graphing functions, estimation

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Additional Tags

math

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Instructional Ideas

• Determine the current Consumer Price Index and determine whether the Rule of 72 works for it

Classroom Considerations

• Requires pupils to solve exponential equations
• The class should be able to write an exponential function that models a situation

Pros

• Provides an answer key with explanations
• Denotes the domain and big idea for the assessment

Cons

• Contains dated information

Common Core

HSA-CED.A.1 HSF-BF.A.1.a HSF-LE.A.1.a HSF-LE.A.2 MP5 MP7 MP8