とけいのみかた　時計を使った計算ゲームアプリ。

This is an app that allows you to study calculations using a clock. The difficulty level is divided into details, so you can study according to your needs. Furthermore, the questions are not fixed, but are determined by the AI ​​each time, so questions that suit each student's ability will be asked. It also has addition and subtraction functions, so you can improve your calculation skills.