The 2018 PISA results show that Indonesia ranked 74th out of 79 participating countries. The rationale behind this lies in the fact that students are unaccustomed to engaging with mathematical literacy questions, particularly those concerning twodimensional geometric shapes. Furthermore, the instructional model employed does not yet adhere to a student-centred approach. The study aimed to analyze and determine the effectiveness of case-based learning assisted by math song media on students' mathematical literacy in the material of geometric shapes of cubes and blocks at State MTs Negeri 2 Semarang City. The research method was a mixed method-exploratory sequential design. The population was all students of class VIII MTs Negeri 2 Semarang City. The sampling technique was purposive sampling, with 32 students of class 8th grade B as the sample. The research instruments included observation sheets, questionnaires, interview guides, and mathematical literacy tests. Qualitative data analysis techniques were data reduction, data presentation, and conclusion and quantitatively using the normality test, Paired Sample t-test, and N-Gain test. The percentage of students interested in learning was 78.4%, and the teacher's response questionnaire was perfect, 88.9%. The acquisition of the Paired Sample t-test was Sig. (2-tailed) 0.000 means 0.000 <0.05 Ha accepted; in conclusion, there is a difference in mathematical literacy's pre-test and post-test averages, increasing from 53.06 to 86.34. The N-Gain test results obtained 0.7 with a percentage of 65.1% in the category of quite effective. Applying this learning, students are involved in learning and trained to analyze the case's problems critically.