Quick Calculations - Math Geni

This is an APP tool for training mathematical calculations.
Users can use it to train their quick calculation skills, including addition, subtraction, multiplication, and division.
I believe this is an interesting training. The user selects one of four options: addition, subtraction, multiplication, and division. The app will automatically generate 10 related questions. You only need to answer these questions quickly. Because the user's answer accuracy rate, answer time and completion degree will be finally displayed to the user, the purpose is to let the user have a clear understanding of themselves.