Fun and comprehensive math site. Practice almost any kind of multiplication skill you can imagine--for free! Teachers: the site offers a free 30-day trial with many benefits.
www.ixl.com
Alien Addition provides practice with addition in an alien invasion theme. Invading spaceships with addition problems move down from the top of the screen toward a laser cannon on a platform at the bottom.
Tug of War Multiplication is a multi-player tug of war game for multiplication. How quickly the student correctly answers the problem determines how much the tractor will tug. The team with the fastest rate of correct answers will win the game!