## Reflection: Developing a Conceptual Understanding Functions Applications: Money grows and the rainforest disappears - Section 3: Discussion

I like the One Million Dollar problem in this lesson to really drive home the idea of how powerful doubling can become and the overall concept of exponential growth. Sometimes if I am really looking to make a point with students, I take out a roll of credit card tape or paper and start by showing students a small amount. Then I have them help me double it again and again, and the tape stretches all the way across the classroom and soon it's down the hall. I think the idea students being able to see doubling is a powerful one and I really want students to understand how a quantity can get so big so fast.

The Power of Doubling
Developing a Conceptual Understanding: The Power of Doubling

# Functions Applications: Money grows and the rainforest disappears

Unit 7: Functions
Lesson 9 of 11

## Big Idea: What's a better deal: one penny that doubles everyday for a month or 1 million dollars? Students explore functions that grow and decay exponentially.

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Standards:
Subject(s):
Math, Algebra, Exponential growth functions, function, Algebra 1, exponential decay, function
60 minutes

### Amanda Hathaway

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