The lack of knowledge that students can absorb on social arithmetic material which is conveyed only through photos of material has an impact on learning outcomes. The development of Android-based M-Learning media is deemed necessary to overcome the problem of low social arithmetic learning outcomes. This study aims to develop social arithmetic android-based M-Learning media for class VII students of Madrasah Tsanawiyah Negeri 1 North Lampung based on expert due diligence assessments. The research and development method used is the ADDIE model (analysis, design, development, implementation, and evaluation). The use of the ADDIE model in research and development is limited so that it is only the ADD (analysis, design, and development) stage. Time is the limit for the stages of becoming ADD. The types of data are quantitative data and qualitative data. Details of the validation results, the material expert validator gets a percentage score of 100% with the assessment criteria Very feasible, no revision needed, the decision from the media expert validator gets a score percentage of 92.8% with the assessment criteria very feasible, no revision needed, the decision from the expert validator language gets a percentage score of 87.3% with very decent assessment criteria, no need for revision. The results of research and development are products in the form of M-Learning based on social arithmetic android for class VII students of MTs Negeri 1 North Lampung with appropriate criteria based on expert judgment

This research aims to describe the mathematics learning difficulty locations and the mathematics learning difficulties types faced by mathematics education students. This research is a mix method research study which used a quantitative and a qualitative approach. This research’s subjects were students of mathematics education in Muhammadiyah university Kotabumi who had learning difficulties on Transportation Problem. The instruments used here were in diagnostic test and interview guide. The locations of learning difficulties viewed based on students’ mistakes/difficulties in completing the diagnostic test. These students categorized as students who were experiencing learning difficulties were interviewed to obtain confirmation regarding the mathematics learning difficulties types. The research result suggests that mathematics learning difficulty locations faced by the research subjects are factual knowledge 4,68%, conceptual knowledge 11,32%, procedural knowledge 10,93%, and metacognitive difficulties 12,5%. The mathematics learning difficulties types faced by the research subjects are fact remembering difficulty 4,69%, concept remembering difficulty 11,33%, fact understanding difficulty 4,69%, concept understanding difficulty 11,33%, concept applying difficulty 11,33%, procedure applying difficulty 10,16% ,fact evaluating diffculty 4,69%, , concept evaluating difficulty 11,33%, procedure evaluating difficulty 10,16%, written metakognitive communicating difficulty 1,25%, fact observing difficulty 4,69%, concept observing difficulty 11,33% and procedure observing difficulty 10,16%.