Math Fact Fu
Mitch Slater and Stratolab collaborated on a game to teach the multiplication facts. The special part of this app is a series of strategies for each number family. For example there is a great trick to multiplying by 9′s that uses your fingers. Some people can memorize every product in the multiplication table, but if you are having trouble, these strategies will greatly help. Even when you’ve memorized them all, the strategies are great for double-checking your answer.
Check it out at mathfactfu.com.