New activites have been added to complete the interactivity folder :
Balance allows to work with different equivalencies in masses on a visual way.
Cadran allows to work the number of the day with the four basic operations.
Calcul generates automatically a set of operations to resolve.
Train allows to work on the notions of increasing and decreasing numbers.
OpenStreetMap is an alternative to the GoogleMap application with open ressources and without advertising.
The design and the help of the interactivity have been improved as well.