The Middle Grades Math Book: Inventive Exercises to Sharpen Skills is a textbook published by Incentive Publications, Incorporated in 2013. Written by Marjorie Frank and Imogene Forte, this trade paperback book is designed to help middle school students improve their math skills through engaging and creative exercises. With a total of 320 pages, this book is part of the Basic/Not Boring Series and offers a comprehensive approach to teaching mathematics in a fun and effective way.