This study aimed to evaluate the value of justice, one of the 10 core values in the mathematics course curriculum, in the context of an exemplary activity in classroom practice and student interviews, where it was integrated into mathematics learning goals. The case study model was employed. The sample of the study included eight 7th-grade students in the 2018-2019 academic year. An activity prepared about the value of justice and a semi-structured student interview form were used as data collection tools. The data obtained following the implementation of the activity were analyzed using content analysis. Students stated that it was necessary to carry out value-based activities in mathematics classes to understand the importance of the value of justice and to increase social awareness about it. According to the results of the study, it is recommended to plan, implement, and discuss in-class activities in which students can explain their value perceptions according to mathematical problems and actively participate in the process so that their awareness of the value of justice can be increased.