Tic-Math-Toe is a fun game that uses the game Tic-Tac-Toe to help kids add, subtract, multiply, or divide either whole numbers or integers very quickly. The goal of the game is to solve equations to get three answers in a row correct. These correct answers can be horizontal, vertical, or diagonal. However, this is either a one or a two player game. If two players play, each student must also block the other player from winning.
I personally enjoy this game a lot. The difficulty level can be set by grade level from kindergarten to 6th grade. At the higher levels, it looks like it offers practice in pre-algebra. Another fun arithmetic game to try is Spot Kicker.
This game can be played on any device, but I believe it requires an updated version of Flash.