In the Fraction File Cabinet folder you'll find a wide variety of engaging activities to use when teaching fractions. Many of them use cooperative learning strategies and work well in math centers. Most of these freebies don't include directions or answer keys, but you're welcome to use them to create your own classroom lessons.
For more information on math stations and math centers, visit the Math Center page. For more math activities that include full directions, ready-made printables, and answer keys, check out the Math Mini Packs and Math Stations for Middle Grades.
Lunch with Cat and Dog is a fun little book that you can read to your class in about 5 minutes. Cat and Dog argue over the amount of each food item that they are sharing, but they both end up with equal shares. It's a great way to introduce students to basic fraction concepts. You can click the cover to find it on Amazon.com.
Check out this amazing free program from British Government's Department for Children Schools and Families! You can download the "exe" Interactive Fraction bar program and also a video that teaches you how to use the application: