The antivirus report reveals that the app is safe. คณิตคิดเร็ว ป.4 has been originally designed by Travel and Education and it belongs to the Educational category. According to the latest info, the tool is rated 4 on Google Play.
Over 10K users downloaded and set up this application and the most recent update was on Aug 29, 2016. You can get the .apk setup package of คณิตคิดเร็ว ป.4 3 for free and have a look at users' reviews on Droid Informer. This file size doesn't exceed 5 MB and the app runs flawlessly on Android 4.0 and above.