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Straight-sides solid subject matter was one of difficult subject matter to be understood by junior high school students in Indonesia. Developing teaching material was one of alternatives to solve that problem. This research aims to develop the application of Android-based teaching material for straight-sides solid for supporting students of junior high school in comprehend of straight-sides solid subject matter. Define, design, develop, and disseminate were the steps in developing the application. The first step of developing was identify the problem and define the product which will be developed. The next step after product defined was design the storyboard as the guidance to develop the application. Teaching experts and media experts had validated the application. They judged that the application developed was valid. The application had been disseminated to mathematics teachers and students in junior high school. Teachers stated that this application was very useful to delivered concept of straight-sides solid in junior high school while the students stated that it helped them in understanding the concepts of straight-sides solid.

The purpose of this study was to develop teaching material in the form of Android-based application for junior high school mathematics subjects in statistical material that are integrated with WhatsApp social media platform. The procedure for developing teaching materials was carried out through the stages of defining, designing, developing, and disseminating. The platform used to develop teaching material was MIT App Inventor. The teaching materials developed have been validated by two media experts and material experts. The trial of teaching material was carried out to educators and prospective mathematics educators in the Special Region of Yogyakarta and students at Depok 3 State Junior High School. This study has succeeded in developing Android-based teaching materials for junior high school mathematics subjects in valid and effective statistical material. The menus contained in this application consist of material and competency test. On the competency test menu, students can do the test and after completion, the application will display the score of the test results. What interesting about this application, the test results can be sent to the teacher via WhatsApp.

<p class="JRPMAbstractBodyEnglish">Learning mathematics at the elementary school level is very important in planting basic concepts about the concepts being taught. One effective way of learning mathematics in planting these concepts is by using manipulative media. Based on the results of observations of researchers in class II C of Muhammadiyah Elementary School, Nitikan, Yogyakarta obtained: 1) mathematics learning rarely uses the media, 2) the subject of fractions is difficult material with marked results of the pretest only 53.1% who reach minimum completeness criterion. This study aims to describe learning using manipulative media to improve understanding of the subject matter of fractions. This study uses a Classroom Action Research (CAR) design. The subjects of this study are class II C of Muhammadiyah Elementary School, Nitikan, amounting to 32 students. Data collection techniques used are observation and test. Data analysis in this classroom action research is quantitative and qualitative data analysis. The results showed the ability to understand the concept of mathematics in the first cycle is 62,5 % with good criteria and the second cycle is 78.1 %  with good criteria. The results of observations of the feasibility of using manipulative media in learning mathematics on the subject matter of fractions seen based on the activities of teachers and students during the learning process. Based on research that has been done, it can be concluded that the ability to understand mathematical concepts and student learning activities in class II C of SD Muhammadiyah Nitikan increases after the application of learning using manipulative media.</p>