Ментальная арифметика, or Mental Arithmetic, is the ability to perform arithmetic operations quickly in the mind. This program, developed by MyAppBook, helps individuals learn the technique of mental arithmetic using an abacus. With simple skills learned, parents can help their children develop the ability to count in their minds. This will make it easier for children to learn in school and apply these skills in their daily lives. The app covers the basics of mental arithmetic, including what it is, what is needed for training, what an abacus looks like, how to distribute numbers, how to add and subtract on an abacus, how to multiply and divide on an abacus, and the benefits of mental arithmetic.

The app is free and available on Android, making it accessible to many. While there is no subcategory, the app falls under the Education & Reference category. The instructions are clear and easy to follow, making it a useful tool for parents and children alike. With this app, users can develop their mental arithmetic skills and improve their ability to perform quick calculations in their minds.