Some fun and crazy math games to play online are Math Arcade, Sum Tracks and Crazy Tazi M-12. These are all flash-based games. They are free as long as the player's computer does not have an ad blocking program activated.
Math Arcade is a game where the player solves math problems to go through different games of the arcade. Each mini-game is based on a different set of math problems.
In Sum Tracks, the player uses the mouse to drag tiles over round tiles. There are numbers on both tiles and the connected tiles must equal the correct amount. There are 45 levels in all.
Crazy Taxi M-12 is a fun math game where the player needs to follow the math instructions on the screen while controlling a taxi cab. Some math instructions might include crashing into multiple numbers, such as multiples of 7 or 10.