This study aims to determine the improvement of student learning outcomes and activeness by applying the Problem Based Learning (PBL) model. The teacher conveys the objectives, main points of learning, conducts group discussions, exercises questions, provides learning motivation and conclusions on the subject of fractional mathematics for class V UPT SD Negeri Binangun 01. This research is CAR (classroom action research) which contains 2 cycles. Each cycle is carried out once in a meeting. Each cycle begins with the stages of action planning, implementing the Problem Based Learning (PBL) model of action and reflection. The method of data collection is done by means of observation. Data analysis was carried out by comparing the test results in pre-cycle 1 and cycle 2 with descriptive techniques. The data obtained are presented naturally and then analyzed descriptively to get an overview of the facts. To measure student achievement using the class average value on the evaluation results of each cycle. The results showed that the achievement and learning activities of the fifth grade students of UPT SD Negeri Binangun 01 in learning mathematics had increased, this was indicated by the results of observations and results of English learning achievement tests. With these results, it is concluded that the application of the problem based learning model can increase the activity and learning outcomes of fifth grade students at UPT SD Negeri Binangun 01