<![CDATA[The background of this research is the low learning outcomes of students on the material of changes in the state of matter, where 60% of 21 students had not achieved learning mastery. The objective of this study was to examine the effect of the Brain-Based Learning (BBL) model on improving student learning outcomes. This study employed a quantitative approach with a One-Group Pretest-Posttest Design. The sample consisted of 21 fourth-grade students of UPTD SD Negeri 17 Peusangan, selected using a saturated sampling technique. The research instrument was a multiple-choice test. Data analysis was performed using the Paired Samples T-Test. The results showed a significant improvement in student learning outcomes. The average pretest score of 56.0 increased to 84.1 in the posttest. The t-test results showed that the calculated t-value (16.71) > t-table (2.086) with a significance of 0.000 (p < 0.05), indicating a significant effect. The conclusion of this study is that the Brain-Based Learning (BBL) model is effective in improving student learning outcomes on the material of changes in the state of matter in the fourth grade of elementary school.]]>
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