Another great book by the Bluedorn brothers. This book, though not a sequel to Fallacy Detective, should be studied after Fallacy Detective, and preferably after a more formal introductory logic program. Each of the 35 lessons can be done in a single sitting, making this a perfect resource for your middle schooler. Answers to all exercises are included in the book, so this is all you need. Highly recommended to develop critical thinking skills.
The Thinking Toolbox
By Nathaniel Bluedorn & Hans Bluedorn / Christian Logic
When is it dumb to argue? Do your students know the five rules of brainstorming? Who has a good reason to lie? This entertaining and enlightening book turns logic from dry to delightful as it equips kids with tools for critical thinking, developing opposing viewpoints, and scientific investigation. Features end-of-chapter exercises and an answer key. Ages 13 and up. 234 pages, softcover from Christian Logic.