This manual is part of a series of materials designed to reinforce essential concepts in physical science through interactive, language-sensitive, problem-solving exercises emphasizing cooperative learning. The manual is intended for limited-English-proficient (LEP) students in beginning physical science classes. The materials are for teams of two students, the student and the tutor, with a separate workbook for each. Questions appear in the student workbook, prompts and answers in the otherwise identical tutor workbook. This combined document consists of the "Tutor Version" followed by the "Student Version." Unit 1 focuses on solving word problems using five common formulas in physical science. There is a section for each formula, beginning with questions about the formula itself and moving to word problems requiring the target formula. The workbook de-emphasizes numerical answers and guides the student, step by step, through the process of solving a problem. For each problem, students must answer questions measuring comprehension of content, ability to translate words into symbols, and ability to correctly insert numbers in the equation. (MSE)