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National Council of Teachers of Mathematics
The Math Forum: Ask Dr. Math: Learning Multiplication Facts
There are the usual, and some unique, tricks and games to learn and remember the multiplication tables at this site.
Arcademics
Arcademics: Penguin Jump
Multiplayer math game that allows students from anywhere in the world to race against each other while practicing multiplication.
Shodor Education Foundation
Shodor Interactivate: Arithmetic Four
Students try to connect four game pieces in a row by answering whole number and integer problems. They can choose the difficulty level as well as addition, subtraction, multiplication, or division.