<![CDATA[This study aims to prove the effectiveness of the Project-Based Learning (PjBL) model on the mathematics learning outcomes of second-grade students at Al Madina Islamic Elementary School in Semarang. This research is a quantitative study with a Pre-Experimental Design of the OneGroup Pretest-Posttest Design type. The population used in this study consisted of all second-grade students at Al Madina Islamic Elementary School in Semarang, totaling 32 students in the academic year 2023/2024. Data analysis in this study used normality tests, t-test, and n-gain test assisted by SPSS version 26. The normality test was obtained based on the pretest value of 0.115 > 0.05. Meanwhile, the posttest value results showed that 0.061 > 0.05. From the data of the normality test results, it can be concluded that the pretest and posttest values are normally distributed. The t-test was obtained based on the sig (2-tailed) value of 0.000, so 0.000 < 0.05, thus it can be concluded that there is a significant difference between students' mathematics learning outcomes before and after the implementation of the Project-Based Learning (PjBL) model in the pretest and posttest results. The 2-tailed sig value of 0.000 < 0.05, then HO is rejected and Ha is accepted. The n-gain test was obtained from the pretest results of 63.9 to 84.5, while in the posttest results, the average difference was 20.6 and experienced an average increase (n-gain) of 0.57, which is classified as moderately effective. Thus, it can be concluded that the Project-Based Learning (PjBL) model is effective in improving the mathematics learning outcomes of second-grade students in elementary school.]]>
