In "Math Road Trip," students learn about the concepts of addition, subtraction, multiplication, and division of fractions and decimals; explore ratio and proportion; and investigate scale drawing and rate problems as they plan the ultimate vacation for their families. 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 situations 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.