Abacus Mental Arithmetic: 주산N암산주판
Abacus Mental Arithmetic presents the 주산N암산주판, a mobile abacus for learning mental arithmetic. The app is available for Android users and is free to download. The program starts a timer as soon as you begin practicing with the abacus, and it provides a digital textbook that you can study for free. The textbook is useful for learning from longer abacus problems that you can solve with the real abacus. However, the app itself does not provide any comprehensive lessons.
The program is under the category of Education & Reference and has no subcategory. It is licensed for free. There is contact information for the developer, but it is not necessary for using the app.
