The DOST Courseware is a locally-produced, all-original Filipino highly interactive multimedia educational application packages available both in Windows and Android versions, conceptualized, digitized and produced as spearheaded by the Science Education Institute in partnership with the Advanced Science and Technology Institute and in cooperation with the Department of Education Philippine Normal University and University of the Philippines-National Institute for Science and Mathematics Education which aims to develop information and communication technology learning innovation to support the upgrading and improvement of science and mathematics education in the country.
You can get the installation package of Add & Subtract of Dis Fraction 1.0 for free and take a look at users' reviews on Droid Informer. The app works fine on Android 2.2 and above. The download of this application doesn't contain viruses or any kind of malware. DOST - Science Education Institute is the developer of the tool that can be found in the Educational category.
Add & Subtract of Dis Fraction has been downloaded and installed by over 0,5K users and its latest release is dated Dec 5, 2015. On Google Play, the app has been rated 4 by its users.