Funbrain.com is a great site that is full of enrichment activities. The students can participate in games that are gender specific and grade level relevant. From the homepage, the students can click on Math Arcade to play a lot of really neat math games. Computer gaming is part of the students' world. Allowing them to play these types of games will allow them to reinforce the concepts that you have already taught them, but in a manner that is comfortable for them. Suduko is another great activity that is accessible from the home page. It is a great game that keeps kids thinking. This numbers game is great for when a student finishes early. It can also be used as an extra credit problem at the end of a math test. I found a great on-line version of the game that is typically not filtered at school: http://www.funbrain.com/sudoku/Sudoku.html. Many students will find this to be a fun and addictive challenge.