It's a simple app for basic calc training.

[ There are 3 modes ]
- Looking Mode
Answer by looking at questions carefully.

- Listening Mode
Answer by listening to questions.

- Flashing Mode
Answer by gazing at flash questions.

[ Functions ]
- Support four operations. (Plus/Minus/Multiplication/Division)
- You can adjust settings such as digit and so on.
- You can change the speed for listening and flashing.
- Show today's score and total score on main screen.
- Show history of you answered questions before.

The app can be used for abacus training.
Will be calc master by challenging questions that are suitable for you!