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The aim of this research is to identify whether there are differences in students' mathematical problem-solving abilities before and after the implementation of the Student Teams Achievement Divisions (STAD) Learning Model. The study was conducted on 14 fifth-grade students at SD 1 Karangmalang. Data were collected using a multiple-choice test to measure students' mathematical understanding. The research method used was a quasi-experimental design. Data analysis was performed using a paired sample t-test. The results of the study showed that the average score in the posttest was higher compared to the average score in the pretest, indicating an improvement in students' mathematical problem-solving abilities after the implementation of the STAD learning model. Furthermore, the research results also showed that the obtained significance value was 0.000, which is smaller than 0.05. Therefore, the null hypothesis (Ho) is rejected. This indicates that there is a significant difference between the mathematical problem-solving abilities before and after the use of the STAD learning model

This research is an experimental research with pre-experiment method, this research design is the one group pretest posttest. This study aims to determine the effectiveness of the Student Team Achievement Division (STAD) learning model in identifying information and summarizing explanatory text. The samples in this study were VIII grade students. Based on the results of research and data analysis regarding the comparison of statistical values, the comparison of learning outcomes categories and the comparison of the level of completeness proves that the improvement of student learning outcomes can be seen from the data on student learning outcomes through descriptive statistical analysis before using the Student Team Achievement Division (STAD) learning model, the average student score is still below the KKM value, namely 49.57 and after using the Student Team Achievement Division (STAD) learning model, the average student score increases above the KKM, namely 84.21. It is known that the posttest value is 84.21 more than the Pretest value which is 49.57. Furthermore, based on the results of inferential statistical analysis using the t-test formula, it is known that the t_ (count) obtained is 4.371 with the frequency df = 14 -1 = 13, at a significant level of 0.05 or 5% the t_table is 1.770. So t_ (count) > t_table or H_0 rejected H_1 accepted. These results can be concluded that there is a significant increase in student learning outcomes. This means that the use of the Student Teams Achievement Division (STAD) learning model is effective in learning to identify information and summarize explanatory texts in class VIII students of SMP Muhammadiyah 10 Makassar.      

Educational problems always arise along with the development and increase of students' abilities, situations and environmental conditions that exist due to the influence of information and culture as well as the development of science and technology. The geography subject for the material of the Theory of the Formation of the Universe according to the results of observations and interviews made to class X social studies 3 students at SMAN 3 Jember is considered boring material. This study used the classroom action research method. The research will be carried out as many as two cycles, if in cycle I it has been achieved as desired, namely achieved classical completeness, then the implementation of the cycle is stopped, but if the results achieved have not reached the desired one, then continued in cycle II by optimizing the researcher's hard work in applying the STAD learning model so that the expected goals are achieved. The results of learning activities in cycle II are better than learning in cycle I. The application of the STAD model learners has succeeded in increasing students' abilities and increasing student activity by 93.75%, growing awareness to always uphold cooperation in solving problems together so as to realize a high social sense between friends in school