The Effect of Problem-Based Learning Model Assisted by Star Tree Media on Learning Outcomes on The Material of Adding Numbers 1-10 Grade One Elementary School

Learning (PBL) assisted by Star Tree media on learning outcomes on the material of adding numbers 1-10 in grade one elementary school. The background of the study is based on the low achievement of learning outcomes in learning mathematics in low grades, especially in addition material. This research used quasi-experiment method with posttest control group design. The research subjects were first grade students of SDN Senduro 01 consisting of 45 students, with details of 22 students as the experimental group and 23 students as the control group. The instruments used were learning outcomes test. The data were analyzed using Independent Samples t-test. The results of the analysis showed that there was a significant effect of the application of PBL model assisted by Star Tree media on learning outcomes. This finding shows that the integration of the PBL model with concrete visual media such as Star Tree can increase the effectiveness of mathematics learning in early grades. This research provides a theoretical contribution to the development of learning models that are in accordance with the cognitive development stage of elementary school students and provides practical alternatives for teachers in improving the quality of learning.