This is the second of a three-year sequence of courses designed to prepare students for a rigorous college preparatory algebra course. It uses a problem-based approach with concrete models. The course helps students to develop multiple strategies to solve problems and to recognize the connections between concepts. On a daily basis, students use problem-solving strategies, questioning, investigating, analyzing critically, gathering and constructing evidence, and communicating rigorous arguments justifying their thinking. Students work with order of operations with integers and rational numbers, diagrams and equal ratios, percents and scale factors, variable expressions to represent quantities; simplify variable expressions; solve linear equations; compare experimental and theoretical probability; collect and compare data; solve distance-rate-time problems; describe and use angle pair relationships; compute area and perimeter of standard and compound shapes; and compute volume of solids.