플래시암산 (Flash Mental Math) is an educational app designed to help improve concentration and mental math skills. With this app, users can practice calculating sums by quickly solving math problems displayed on the screen. The app allows users to customize the interval at which numbers are shown, ranging from a minimum of 0.1 seconds to a maximum of 3 seconds. It is important to stay focused, as missing a number can lead to incorrect calculations.

One of the key features of 플래시암산 is the ability to create customized assignments. Users can choose the type of problem (addition, subtraction, multiplication), the number of digits, exposure time, and the number of questions. This flexibility allows users to tailor the assignments to their specific needs and preferences.

The app also provides a statistics screen where users can track their performance and see their scores for completed assignments. Additionally, 플래시암산 supports an auditory-based problem-solving mode called "호산암산 (Listening and Solving)."

For any suggestions or issues, users can contact the developer through the app's comment section or via email.