International Journal of Research in Mathematics Education Vol. 1 No. 2, December 2023, 163-174 Universitas Islam Negeri Prof. K.H. Saifuddin Zuhri Purwokerto e-ISSN: 3025-7638, p-ISSN: 3025-1842, https://doi.org/10.24090/ijrme.v1i2.9293 International Journal of Research in Mathematics Education Vol. 1 No. 2, 2023, 163-174 | 163 The Effectiveness of Cooperative Learning Model With Group Investigation (GI) Using Comic Media Towards Mathematical Literacy Ability of VIII Students at SMP Negeri 1 Punggelan Nur Khasanah 1 , Heru Agni Setiaji 2 1 UIN Prof. K.H. Saifuddin Zuhri Purwokerto, Purwokerto, Indonesia 2 Institut Agama Islam Negeri Kudus, Kudus, Indonesia  email: nurkhasanah71812@gmail.com Received July 17, 2023 Accepted November 22, 2023 Published November 27, 2023 Abstract: This study aimed to determine the effectiveness of the GI-type cooperative learning model assisted by comic media in improving the mathematical literacy skills of the eighth-grade students of SMP Negeri 1 Punggelan. This research was experimental research with a quantitative approach. The population in this study were students of the eighth grade of SMP Negeri 1 Punggelan and the samples used were taken by simple random sampling technique. The sample results obtained were students of VIII G and VIII H, consisting of 58 students. The instrument used in this study was a description test consisting of a pretest and a posttest. The results of this study showed that the average mathematical literacy ability of students who were subjected to the GI-type cooperative learning model assisted by comic media was better than those who were not subjected to it, as seen from the results of the N- Gain test, namely the experimental class obtained an average N-Gain value of 0 .77 with high criteria, while in the control class, the average N-Gain value for the control class was 0.47 with moderate criteria. In the t-test, the two independent samples showed a significant result of 0.000 <0.05, meaning that there was a significant difference in students' mathematical literacy skills between the experimental and control classes. The GI-type cooperative learning model assisted by comic media was shown to be effective for increasing mathematical literacy skills with the average N-Gain test results obtained in the experimental class by 77% with effective criteria and in the control class by 47% with less effective criteria. Keywords: Comic media; GI type cooperative learning model; Mathematical literacy ability. A. Introduction Mathematics is a way to find answers to problems faced by humans, namely a way of using information, knowledge of shape and size, knowledge of counting. According to Content Standards (SI), the objectives of the mathematics subject show that the curriculum is structured with attention to aspects of mathematical literacy (BSNP, 2006). This is because mathematical literacy is very important for everyone because it can help someone to recognize the role of mathematics in the real world and make the necessary considerations and decisions. Mathematical literacy ability is the ability to formulate, apply, and interpret mathematics in various contexts. With mathematical literacy students can develop and apply mathematical knowledge in the real world. Mathematical literacy emphasizes to students that mathematics does not only count and master the material, but also pays attention to reasoning