These Working Papers are to be used in the study of chapters 1-17 of C21 Accounting Multicolumn Journal Approach text. Forms are provided for: Work Together exercises On Your Own excercises Application Problems Mastery Problems Challenge Problems Reinforcement Activities 1 and 2 Printed on each page is the number of the problem in the textbook for which the form is to be used. Also shown is a specific instruction number for which the form is to be used. You may not have to use every form that is provided. The pages are perforated so that they can be removed.