Ethnomathematics is the study of mathematics that examines the correlation between mathematics and cultural activities within a particular community. Ethnomathematics refers to an activity in society that is carried out in daily activities as a culture related to mathematics.  This culture is found in cultural heritage related to General Soedirman, one of which is Batik Soedirman. Soedirman Batik is a new innovation in batik craftsmanship found in Purbalingga Regency. This research aims to explore the mathematical elements in Soedirman Batik motifs. The researcher employed qualitative research methods with an ethnographic approach. The subjects of this study included the Regional National Crafts Council of Purbalingga, Wastralingga Batik Center, the owner of Tien Batik Center, and batik artisans. Data collection techniques involved interviews, observations, and documentation. Data analysis was conducted using Spradley's model, which includes domain analysis, taxonomic analysis, componential analysis, and thematic analysis. The results of this study indicate the presence of mathematical elements such as repeating patterns, unit conversion, plane figures, lines, congruence, geometric transformations, and trigonometric function graphs in the Soedirman Batik motifs.

This research aims to improve student learning outcomes through the application of the Problem Based Learning (PBL) learning model integrated with the Teaching at The Right Level (TaRL) learning approach. This research was conducted at a partner school when implementing PPL II, namely SD Negeri Datar. This type of research is Classroom Action Research (PTK). Data collection methods use test techniques (evaluation questions), non-test techniques (teacher activity observation sheets and student activity observation sheets), and documentation. The type of research is quantitative. The research subjects were fourth grade students at Flat State Elementary School with a total of 31 students. The research results generally show an increase in students' science and science learning outcomes, which can be seen from the average score in cycle I of 70.3 with a completion percentage of 54.8%. The science learning results in cycle II obtained an average of 80.09 with a completion percentage of 90.3% with very good criteria. The results of the research show that the application of the Problem Based Learning (PBL) learning model integrated with the Teaching at The Right Level (TaRL) learning approach is very effective to be used to improve science and science learning outcomes for class IV students at SD Negeri Datar in 2023/2024.