Development of critical thinking skills requires learning strategies that encourage students to carry out supporting activities for critical thinking skills development. This study aims to find out the various types of supporting activities for critical thinking skills development based on students' perspective. This study used an exploratory survey method. Data was taken with an open questionnaire from 58 students of the mathematics department at a university in Central Java. The results show that supporting activities for critical thinking skills development based on students' perspective in a row from the most supportive are discussion (37.10%), question and answer (22.58%), get an explanation or motivation (14.51%), try or solve problems (9.68%), presentation (8.06%), work on project tasks (4.84%), and solve HOTS problems or problems related to everyday life (3.23%).