The rules are simple. Fill in the blanks with numbers from 0 to 9 so that multiplication and division can be completed.
* However, 0 is not entered in the leftmost cell.

Questions are generated each time by the app program.
The positions of the holes are determined at random.
The last 50 questions created are automatically saved, and you can select and play them again later.
Equipped with a memo function, undo and redo, and a lock function for entered numbers, making it easier to organize ideas.
Please try once.