This research aims to produce the teaching materials based on Android which is valid and practical in order to support the senior high school students in learning arithmetic sequence and series for problem based learning. The subjects of this research were the eleventh and twelfth grade students of Senior High School Number 1 Indralaya Utara. This research is kind of development research by adapting model development of ADDIE. The stages of the research conducted consist of analyze, design, and development. Data collection techniques which were used in this research were by walkthrough, observation and questionaire. The result of this research is teaching materials of arithmetic sequence and series based on Android for problem based learning are valid and practical. Said to be valid because based on the assessment of experts who stated that in terms of content, construct and language in teaching materials had met the valid criteria. Whereas, based on the results of the questionnaire and observation it was concluded that the students think that this teaching materials is interesting, easy to use, easy to understand, can improve enthusiasm for learning and can help to improve concepts understanding of students.

This paper is retracted by editor due to publication ethics missconducted by author (simultaneously publication in other journal).

At the beginning of 2020, the country of Indonesia was hit by a virus outbreak that we often know as COVID-19. This greatly affects all sectors in Indonesia, especially in the field of education. That is why, the rate of education in this pandemic era is very low. Even so, the Indonesian government always tries to advance education by issuing programs that help Indonesian students to keep learning. For example, by publishing online learning programs (on the network) as well as student quota funds or fees. Although it doesn't run like normal learning in general, this program might help a little. Unfortunately, the consequences of this program also cause many problems or problems that occur. Both internal and external factors. Social studies learning is one of the fields of study that includes social sciences, humanities and social problems of life. At the elementary school level, this learning is one of the important areas to learn, but since learning is done online, there are many things that create an obstacle in this learning. Therefore, it is necessary to solve problems in elementary social studies learning barriers to help realize the importance of social studies learning.