Examples and exercises are provided in a sequential approach designed to familiarize the student with percents, fractions, and ratios. Key words used in the workbook are identified first, followed by exercises focusing on 14 learning objectives: (1) identifying the whole as 100%; (2) expressing a part of 100 as a ratio; (3) changing a fraction in hundredths to a percent and vice versa; (4) renaming a fraction to an equivalent fraction in hundredths; (5) determining the percent of a part of a figure; (6) writing a decimal as a percent and vice versa; (7) writing a ratio as part of the total; (8) solving for a variable in a proportion; (9) finding a percent of a number using a proportion; (10) finding a number when the part and the percent of the proportion are known (e.g., 15% of 12); (11) determining the percent one number is of another (e.g., what percent of 50 is 30); (12) solving word problems involving percents; (13) solving percent problems with percents greater than 100; and (14) solving percent problems with percents less than 1. Included in the workbook is a series of word problems designed as a post-test to be used in measuring student achievement. An answer key is provided. (JP)