According to the antivirus report, はんぷく計算ドリル 四則演算② 引き算（小学校１年生算数 doesn't contain viruses or any kind of malware. The tool is designed by 学校ネット株式会社 and its category is Educational. On Google Play, this application was rated 3.3 by its users.
The latest release was on Sep 7, 2015 and the app was downloaded and installed by over 50K users. Get the .apk file of はんぷく計算ドリル 四則演算② 引き算（小学校１年生算数 2.8.5 for free and read users' reviews on Droid Informer. This setup package requires 7 MB of disk space and it works flawlessly on Android 4.0 and higher.