Bài tập Toán lớp 4 is an Android application developed by Gminh Kids that aims to assist young students in learning and testing their knowledge of Mathematics for the fourth-grade level. With a user-friendly interface and diverse content, this app helps increase students' interest in the subject.

The app has two main sections: Practice and Test. The Practice section offers various types of math problems through games, such as solving equations, working with fractions, and solving challenging math puzzles. The Test section allows students to assess their knowledge through various tests, each consisting of ten questions of different math problem types. Students have ten minutes to complete each test, and they can view their results after submission. To unlock the next test, students must answer at least five questions correctly in the previous one.

Overall, Bài tập Toán lớp 4 is an excellent app for young students to enhance their math skills and improve their problem-solving abilities in a fun and interactive way. Parents can also use this app to find interesting math problems for their children to solve.