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. This game can also help students learn their addition and subtraction fact families.