Giải toán lớp 3 (which translates to "Solving 3rd-grade math") is an Android app developed by NDT Production for students in Vietnam. The app is designed to help students practice math problems, and it is specifically targeted at 3rd-grade students. The app provides a collection of exercises from different sources, including textbooks and supplementary materials. The exercises cover a wide range of topics, including addition, subtraction, multiplication, and division.

The app is free to use and does not require an internet connection. It is an excellent resource for parents who want to help their children practice math at home. The app is easy to use and provides step-by-step solutions to each problem. Overall, Giải toán lớp 3 is a useful app for students who want to improve their math skills and for parents who want to help their children succeed in school.