Field Trips and Fund-Raisers: Introducing Fractions is one of five units in the Contexts for Learning Mathematics Investigating Fractions, Decimals, and Percents (46) The focus of this unit is the development of fractions. It begins with the story of a class field trip. The class is split into four groups and each group is given submarine sandwiches to share for lunch. Upon returning from their trip, the students quarrel over...