This book is a supplement to the text Teaching Fractions and Ratios for Understanding.It is not merely an answer key, but a resource that includes in-depth discussions of the problems in the text; develops and extends discussion of the issues, teaching problems, and other considerations raised in the chapters; and contains additional problems--with and without solutions--that instructors may find helpful for assessment purposes. In the second edition, MOREhas been reorganized so that supplementary activities immediately follow the discussions of the activities from the text. Solutions to these supplemental activities have been removed to facilitate the use of MOREin courses. Nevertheless, because the number of activities in each chapter of the text has increased and complete discussions of all of them are provided in MORE,there is ample opportunity to learn reasoning methods.