Recommended for informal learning

The app is simple, clear and understandable under construction.
There are different subjects (arithmetic, multiplication tables, bubbles) with varying degrees of difficulty (Easy, Medium, Heavy, expert). My daughter goes to the 2nd class and can expect great here already, and play. Because multiple users can store, we often play against each other.
The app is fun !!! Also suitable for math muffle!
The only slight nerve factor, the in-app deals.