Comprehensive math site! Practice almost any kind of fraction skill you can imagine, including many on comparing fractions--for free! Teachers: there's a free 30-day trial with many benefits.
www.ixl.com
Tug of War Fractions is a multi-player tug of war game for comparing fractions. How quickly the student correctly answers the problem determines how much the bike will tug. The team with the fastest rate of correct answers will win the game!