Basic facts are the foundation of math as students move on to more difficult mathematical concepts. Without FLUENT knowledge of the basic facts, students tend to struggle with the most basic parts of problems, unable to see "the bigger picture." Students NEED fluent knowledge of their addition and subtraction facts FIRST, before moving on to multiplication and division. These math concepts build upon each other, providing that solid foundation.
Here are some fun math sites to help students learn their basic facts
Addition & Subtraction Fact Games
Multiplication & Division Fact Games