Practice you for mathematical operations. Ideal for children but also fun for adults to practice math! Three difficulties can be chosen. Math Training for Kids is totally free, and there is no ads.
A free .apk installation package of Math Training for Kids 1.5.6.20 is available from Droid Informer and you can check out users' reviews on this site. Prepare 7 MB of free space on your device for this app setup package and take into account that it works fine on Android 1.6 and higher. The app was checked for viruses and it was found 100% safe. Divmob kid developed this application that falls into the Educational category.
The tool was downloaded and set up by over 0,5M users and its latest stable release was on Feb 11, 2017. According to the latest information, Math Training for Kids is rated 3.9 on Google Play. The app is very popular among Samsung and Lenovo users.
As users mention, the weak side of this application is bad ads.