One of the main challenges facing lecturers is preparing their students to face the transition from acquiring knowledge of problem-solving skills to the challenges they will face after graduation. This study presents ill-structured mathematical problems (ISMP) to develop students' creative thinking. This research was conducted by giving a two-point ISMP pre test to 130 students in the fourth and sixth semester of the Mathematics Study Program and Mathematics Education on two state Islamic religious college campuses. Researchers evaluate and categorize students' abilities based on indicators of ISMP solving ability. Furthermore, six research subjects were selected from students who had the potential to think creatively. The results show that the presentation of ISMP is useful for developing students' creative thinking. In solving ISMP Students create diverse and correct answers, done in many different ways, and create a variety of different answers and correct. The development of creativity of students looked after given ISMP second, with the increasing variety and correct answers, the emergence of a variety of different ways, and creation a variety of different answers and correct. This happens because the ISMP has several solutions, has a specific context and complex situations; and in accordance with everyday life so that students feel they experience the problem.