The Interactive Discovery-Based Units for High-Ability Learners, for grades 6-8, provide teachers with opportunities to use exciting and challenging units in their classrooms. These engaging curriculum units culminate in authentic performance platforms that provide students with open-ended opportunities to demonstrate academic understanding. Each book in the series contains tiered lessons that teachers can easily modify to meet individual students' needs. In "Mathematics in the Marketplace," student bankers, stockbrokers, and investors use the stock market to make investment decisions. This dynamic, teacher-friendly unit targets the concepts of estimation; addition, subtraction, multiplication, and division of decimals; and percentages, and can be easily modified to incorporate fractions.