From the text: Fraction division is one of the least understood operations in school mathematics. However, just having knowledge of the invert-and-multiply algorithm does not guarantee that students will recognize a problem situation involving fraction division. The National Research Council recommends teaching fraction division within a real-world context to enable students to build connections between whole number operations and division by fractions. We used the context of serving pizza to a crowd of people to help prospective elementary school teachers understand fraction division. Students worked with pizza models and drew diagrams to show how many thirds are in 1 or more pizzas and then applied proportional reasoning to determine the number of servings in 50 pizzas.