Make 5 (http://www.fi.uu.nl/toepassingen/00091/toepassing_wisweb.en.html) Make 5 is a fun way for students to practice addition, subtraction or multiplication. Students can play this game individually or against another student. This game provides a great platform for students to practice math facts and to start recognizing relationships between numbers. Students are given a target number and a goal to choose an equation on the grid that equals that target number. There are multiple correct answers on the grid. The goal of the game is to get 5 answers in a row on the grid (like Tic-tac-toe or connect 4). If you don’t have access to classroom computers to play this game, split your class into two groups and play with the whole class with an interactive whiteboard or projector. Each student should be given the chance to represent their team and match an equation with a target number. Give teams 30 seconds to plan their move before sending up the representative.
Again from http://ilearntechnology.com/?p=3647