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.