Make money disappear! Young scholars watch as a copier shrinks a dollar bill to 75 percent of its size. Learners are left to determine the size of the dollar bill after nine passes through the copier.

Concepts

exponential functions, geometric sequences, geometric series, math modeling, percents

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Additional Tags

math

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Instructional Ideas

• Post copies of a different-sized object shrunk with a copier using the same rate of decrease
• Incorporate as an introduction to geometric sequences

Classroom Considerations

• Expects a solid understanding of percent change

Pros

• Includes different options as extensions to the activity
• Provides an option to download the video for use offline

Cons

• None

Common Core

HSF-LE.A.2