One thing that the causes boring mathematics learning is teachers often do not relate the concepts to students' experiences in their life. This research aims to develop learning designs based on realistic mathematics education on entrepreneurship arithmetic content in junior high school. In this paper, a preliminary learning design is described comprehensively to be used to produce a Hypothetical Learning Trajectory (HLT). The method is qualitative by reviewing several references, conducting observations, and group discussion forums. The results of this study are five stages to increase students' interest in learning, conceptual understanding, and problem-solving, including engagement with content and context, story of entrepreneurship on video, concept deepening, collaboration to solve problems, and making conclusions. The context of this research is the life surrounding the students combined with the 4.0 era development, namely Badung traditional markets, offline malls and online malls, and 3D printing. Instruments designed supporting these five stages are learning implementation plans, student worksheets, video presentations, and PowerPoint slides.

The 2013 curriculum emphasizes student activity in the learning process. Therefore, learning resources used are expected to support the curriculum. Learning resources used in schools are in the form of textbooks and worksheets which only contain a summary of material and assignments for students. This makes students demotivated to learn mathematics. This study aimed at developing a valid, effective and practical mathematics learning module based on Realistic Mathematics Education (RME). The learning module intended to make it easier for students to understand the set material. This study used the 4D method, namely define, design, develop, disseminate. The product developed was a mathematics learning module that links up students' daily experiences with mathematical concepts. The subjects involved in this study were experts including material and media experts and the students of class 7D of SMP Sapta Andika Denpasar represented by 10 students as research samples. Questionnaire on the practicality of the module used in the learning process was used as data collection techniques. Further, the data were analysed quantitatively and qualitatively. The results of the study showed that, in terms of the validity of the product developed, it was valid in the material aspect and highly valid based on the assessment of media experts. After completing the product tryout, the learning modules developed were effective and practical based on the test results and questionnaires conducted to teacher and students. Thus, the learning modules developed were ready to be used in the real learning process.