Nash! is a fun app for practicing math facts. Choose a difficulty and the operations you want to practice -- focus on a single operation or select multiple. Then, start the timer, and you have 60 seconds to do as many math problems as you can. The harder the problems, the more points you get. Play to beat your highest scores and master all five operations!
Since there is a timer it really gets you motivated to get the most number of math facts correct. This really helps because you want to do math, you are not forced to.