This Illinois State Board of Education teacher's guide on business computations is for students enrolled in the 9th or 10th grade. The course provides a foundation in arithmetic skills and their applications to common business problems for the senior high school vocational business courses. The curriculum guide includes teacher and student activities that can be implemented in many ways. Information on how to integrate the activity objectives of the Illinois Plan for Business, Marketing, and Management into the State Learning Goals also is included. A model for the curriculum is presented that suggests areas and grade levels of study, and a plan for implementing the course is provided. A partially annotated bibliography lists 58 print, 13 audiovisual, 45 computer software, and 19 other resources. The guide contains 17 units: keeping cash and checkbook records; computing total pay; computing regular and overtime pay; computing net pay and commissions; computing costs of fringe benefits and job expenses; selling merchandise at retail and wholesale levels; selling goods at the manufacturing level; financing business through loans; saving and investing; acquiring, maintaining, and operating plant and equipment; computing transportation expenses; computing taxes; computing cost of insurance; understanding business data; understanding types of business organization; solving other business problems; and using metric measurement. Each unit plan contains the following: an overview, outline, objectives, teacher resources, evaluation ideas, and student activities. Student activities include name, use, objectives, facilities or materials needed, description, and teacher and evaluation suggestions. Three appendices are provided: integration of instructional activities to state learning goals; crosswalk of instructional activities to skills and state learning goals; and an integrated organization of instructional activities for the business and technology concepts course. (NLA)