<![CDATA[This study aims to determine the effect of motivation and learning discipline on mathematics learning achievement through problem-based learning model of third grade students of SD Negeri 2 Mariri Lama. This study uses a quantitative approach with ex post facto research type. The method in this study used correlational method or cause-effect relationship and the sample in this study amounted to 20 students through total sampling technique. Data collection techniques using questionnaires to measure motivation and learning discipline, and teaching treatment using the application of PBL learning model to obtain data on students' mathematics learning achievement. The data obtained were then analyzed using descriptive tests, normality tests, linearity tests, multicollinearity tests, and hypothesis tests which include t tests and F tests. The results of this study indicate that learning motivation and learning discipline have a positive and significant effect on students' mathematics learning achievement both partially and simultaneously as evidenced by the significance value of the F test of 0.048 <0.05. The average value of learning motivation (79.55), learning discipline (77.15) and mathematics learning achievement (81.25). Based on the research results, it was concluded that motivation and learning discipline supported by the problem-based learning (PBL) model had an important influence in improving the mathematics learning achievement of grade III students at SD Negeri 2 Mariri Lama. Keywords: learning motivation, learning discipline, mathematics learning achievement, Problem Based Learning (PBL) ABSTRACT This study aims to determine the effect of motivation and learning discipline on mathematics learning achievement through problem-based learning model of third grade students of SD Negeri 2 Mariri Lama. This study uses a quantitative approach with ex post facto research type. The method in this study uses a correlational method or cause-effect relationship and the sample in this study amounted to 20 students through a total sampling technique. The data collection technique uses a questionnaire to measure motivation and learning discipline, and teaching treatment uses the application of the PBL learning model to obtain data on students' mathematics learning achievement. The data obtained were then analyzed using descriptive tests, normality tests, linearity tests, multicollinearity tests, and hypothesis tests which include t tests and F tests. The results of this study indicate that learning motivation and learning discipline have a positive and significant effect on students' mathematics learning achievement both partially and simultaneously as evidenced by the significance value of the F test of 0.048 <0.05. The average value of learning motivation (79.55), learning discipline (77.15) and mathematics learning achievement (81.25). Based on the research results, it was concluded that the motivation and learning discipline supported by the problem-based learning (PBL) model significantly influenced the mathematics achievement of third-grade students at SD Negeri 2 Mariri Lama. Keywords: learning motivation, learning discipline, mathematics achievement, Problem-Based Learning (PBL)]]>
