Mastore is a free online math training web application designed specifically for students from first grade to junior high school. The platform focuses on enhancing mental calculation skills, allowing users to practice various problems ranging from basic number decomposition to more complex equations, all with the goal of solving each question in just three seconds. Mastore features a robust review function that enables students to revisit challenging problems and an automatic recording feature to track their progress over time.

The application is accessible on both smartphones and PCs, providing a convenient learning experience without the need for registration. With its engaging approach and targeted practice, Mastore aims to support students in achieving their math proficiency goals and instilling confidence in their calculation abilities. Whether a beginner or looking to improve, Mastore makes math practice enjoyable and effective for young learners