Mental arithmetic training application.
If you win 10 games in a row, you will go to the next level.
level1 : 5÷1, 7÷1, ...
level2 : 8÷2, 14÷2, ...
level3 : 6÷3, 24÷3, ...
...
level9 : 18÷9, 54÷9, ...
level10 : Review Questions
In Japan, 8-9 years old (3rd grade)