Missing one crucial thing

Im giving this app four stars as its creative and the difficulty system works very well. However, its missing one very important feature. It would be fantastic if the progress was able to be saved. Ive had to restore my phone a few times and my son loses his progress which is very unfortunate and annoying. Whether the data is stored on the developer servers or the phone. Whatever it would take to be able to restore the data.

Add this and I give it five stars.

Jrm6965 about Quick Math Jr., v1.5.12