This manual was prepared for use by Peace Corps Volunteers in solving field problems requiring mathematical calculations. It contains problem examples and data pertinent to the needs of volunteers, with many of the problems and exercises developed from on-the-job problems. Primary emphasis is given to providing answers and procedures for solving specific agricultural mathematics problems. Each of the six units may be used as a review or as new material. Unit A focuses on preliminary information and review on measuring tools, geometry, area and volume, and weights and measures. Unit B considers problems related to water and irrigation; unit C, problems related to construction; unit D, problems related to land leveling and crop production; unit E, problems related to agricultural machinery; and unit F, problems related to temperature and to calculating interest. A set of tables is also included. (MNS)