Thin Slicing Activity Your students will be engaged while calculating slope during this cooperative group activity. Although I designed this 30 question activity for groups, it can also be used as classwork, homework, a study guide, or as a quiz. This is a Thin Slicing Activity based on the research of Peter Liljedahl, Building Thinking Classrooms (BTC) in Mathematics. This activity contains 3 challenge levels: Mild, Spicy, and Wicked Hot. There is an increase in challenge from one level to t