Learning outcomes are certain competencies or abilities achieved by students after following the teaching and learning process and include cognitive, affective and psychomotor skills. The aim of this research is to improve student learning outcomes through number bag media in the mathematics subject of addition and subtraction of numbers for class I students at SDN 14 Panai Tengah. Learning outcomes are certain competencies or abilities achieved by students after following the teaching and learning process and include cognitive, affective and psychomotor skills. This research is classroom action research (PTK). This classroom action research uses a research design developed by Kemmis and Mc Taggart in the form of a tool with one tool consisting of four components, namely: planning, action, observation and reflection. This research was carried out in several cycles, where each cycle carried out 2-3 meetings/learning activities. Based on the results of evaluation tests carried out in cycles I and II, data was obtained regarding students' mathematics learning outcomes in addition and subtraction material. In the first cycle, 70.93% of students obtained a score of more than 70, which was still classified as unsatisfactory. However, after implementing learning actions, there was a significant increase in cycle II, where 86.8% of students managed to get a score of more than 70. Based on these results, it was concluded that the evaluation of student learning outcomes in cycle II showed very positive results. The students' average score increased to 86.8, far above the KKM set at 70. A total of 93.3% of students succeeded in reaching or exceeding the KKM standard, indicating that the intervention carried out succeeded in improving students' understanding and skills significantly.