A free app for Android, by Peekaboo Studios.
4th Grade Math Challenge is a math game for kids. It's one of the best math games for kids. The questions are all 4th grade level, so you will see hundreds of questions you have to solve. Try to get every single one right and see how many you can get. Try to beat your own score and get more points. You can also compete with your friends and try to get the highest score.
The game has a simple and intuitive interface. You can get all the questions at the first glance. There are 4 different modes: free mode, practice mode, challenge mode, and timed mode. The first one is free and you can play it anytime you want. The other 3 modes are for practice and you can play them only when you have time.