This research was conducted with the aim of determining the Influence of the Cooperative Learning Model of Group Investigation (GI) on student learning outcomes in mathematics for fourth-grade students at SDN 0306 Sosopan. The population in this study consisted of 48 students, divided into Class IV A with 24 students and Class IV B with 24 students. The research sample consisted of 24 students selected using the Total Sampling technique. The research type employed was an experiment with a Quasi-Experimental Design of the Pretest-Posttest Control Group Design. The research procedure included preparation, implementation, and conclusion stages. Before conducting the research, an instrument validation test, reliability test, difficulty level test, and discriminant power test were conducted. Subsequently, a pretest was administered to both classes, with the experimental class receiving treatment by implementing the Group Investigation (GI) learning model, while the control class used a conventional model. Finally, a posttest was administered to both classes. Data were analyzed using SPSS 24, including tests for normality, homogeneity, and hypothesis testing. Based on the students' learning outcomes, the experimental class obtained an average score of 41.04 in the pretest, which increased to 77.08 in the posttest. Based on the research results, it can be concluded that there is an influence of the Group Investigation (GI) learning model on student learning outcomes in mathematics for fourth-grade students at SDN 0306 Sosopan.

The purpose of this research are 1) To determine the attention of parents of class VI students at SD Negeri 122368 Pematang Siantar T.A 2023/2024, 2) To determine the mathematics learning outcomes of class VI students at SD Negeri 122368 Pematang Siantar T.A 2023/2024, 3) To determine the effect of attention parents on the mathematics learning outcomes of class VI students at SD Negeri 122368 Pematang Siantar T.A 2023/2024. This type of research is quantitative research with an ex post facto method. This research sample used total sampling, namely all class VI students, totaling 35 students, consisting of 15 male students and 20 female students. Data collection in this research was carried out using questionnaires and documentation. The data analysis technique used is a simple linear regression test and a significant test (t test). The results of the research show that there is a significant influence between parental attention (X) on mathematics learning outcomes (Y) of class VI students at SD Negeri 122368 Pematang Siantar T.A 2023/2024. This is proven by the tcount value for the parental attention variable (X) of 6.287 while the ttable value is 1.69236, so tcount > ttable (6.287 > 1.69236), with a sig value ? = 0.00 < 0.05 so it can be stated that Ho is rejected and Ha is accepted. Variable contribution.