This can be a multiplayer, where students compete against each other or a computer in answering subtraction questions.  The faster they answer the faster their jet ski moves.

This math video has Kermit the Frog teaching kids how to subtract with a little humor.

Students use solutions to subtraction problems in order to speed their duck around the track.  The faster they answer the faster their duck goes.

Play a multiplayer game where cats have to pick two numbers that equal the target number.  This is a timed game that can either be played with other players or the computer.  This game will work on addition fluency.

This game will improve a students subtraction fluency skills as they have to quickly answer subtraction questions in order to destroy the invasion.

This is a great game that works on multiplication and division fluency by having students create a fact family.  Numbers get larger as you advance through each level.  It can also be used for addition and subtraction fact families.