This guide, part of a series of workplace-developed materials for retraining factory workers, provides teaching materials for a workplace mathematics course. The course is a review of basic number concepts focused on helping participants to understand the meaning of numbers and arithmetic operations. The introductory materials include a course outline, course objectives, a topical outline, information on course length and continuing education units, and resources. Lesson plans for 12 sessions are provided on the following topics: math anxiety, place value, multiplication and division tips, addition and subtraction shortcuts, problem solving, whole number operations, rounding, estimation, decimal operations, decimals in job-related situations, decimal applications, tolerance, radius and diameter, fractions and mixed numbers, converting fractions to decimals, reading a fractional inch scale, screw measurement, metric and English systems, percents, graphs, charts, paychecks, benefits, ratio and proportion. The session materials include objectives, topics, methods, evaluation criteria, a pretest and a posttest, information sheets, and handouts. (KC)