This is the first 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 integers and proportions; collect, organize, and display data in multiple ways; make sense of multiple representations with fractions, decimals, and percents; define variables and simplify expressions; solve distance, rate, and time problems; compute area and volume of rectangular solids; and solve percent problems including discounts, interest and tips.