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# Pizza Pi

## Should you ever order a personal-sized pizza from Pizza Hut?

Should you ever order a personal-sized pizza from Pizza Hut? Pizza Hut pizzas come in large, medium, and personal. While the smallest size is the least expensive, it costs the most per square inch and is over half crust!

In this lesson, students calculate circle areas to compare the unit costs of different sized pizzas, find the percent of pizza that is tasty inside vs. crust, and debate whether it’s ever a good idea to order a personal-sized pizza from Pizza Hut.

### REAL WORLD TAKEAWAYS

• If crust thickness doesn’t change (and it usually doesn’t), then as a pizza shrinks ,more and more of the total area is taken up by crust.
• Determining the best deal isn’t just about how much you get, it’s also about how much of it you want.
• Personal pan pizzas are mostly crust.

### MATH OBJECTIVES

• Calculate the area of a circle
• Use geometric models to solve real-world problems
• Use unit rates or proportional reasoning to determine the best deal

Appropriate most times as students are developing conceptual understanding.