Minimum Competency Assessment (MCA) is the latest assessment conducted nationally in Indonesia. MCA measures students' cognitive in literacy and numeracy. This study illustrates the difficulty of students in solving numeracy questions in the minimum competency assessment. This research is included in case study research with a qualitative approach. Data was collected by documenting students' responses to MCA numeracy questions and interviews with math teachers from one school in Mesuji Regency, Indonesia. The analysis technique used is technical triangulation, which includes tests, interviews, and documentation. In addition to students, data were also taken from interviews with math teachers. The results showed that students' difficulty in solving numeracy problems was that students' literacy skills were still lacking, so students had difficulty visualizing and representing mathematically, students did not understand mathematical modelling of the contextual problems given, students' mathematical reasoning was still relatively low, and students were still not used to solving various types and types of counting problems in MCA. [For the complete proceedings, see ED672779.]