This course is designed to review the arithmetic skills used by many Marines in the daily pursuance of their duties. It consists of six study units: (1) number systems and operations; (2) fractions and percents; (3) introduction to algebra; (4) units of measurement (considering both the metric and United States systems); (5) geometric forms; and (6) problem solving. Each unit begins with a general objective and is divided into numbered work units, each presenting one or more specific objectives. Motivation and interest in each topic is developed by use of practical problems, and the presentation of the history and principles underlying each subject. Exercises (with answers) are included throughout the units and the manual concludes with a review lesson designed to better prepare students for the final examination and consisting of questions and an answer sheet to be filled out and returned to the Marine Corps Institute. Supporting information (such as materials needed and forms for lesson submission, grading, and assistance) is also included. (JN)