Happy arithmetic "Danbuns GATE" by healthy excellent infant Danbun appears in the iPhone application. Count the apple, add, subtract and write answers. Hippo and Danbun appear in the questions, they fuss over. Five questions that can be enjoyed free of charge.
There is a thing with a large screen, too! There is iPad version, too.
There is a pay version to be able to enjoy the problem of 100 questions, too.