Mathematics learning at the elementary school level requires an appropriate approach to build students' conceptual understanding and self-efficacy. Based on observations, there is still a low level of mathematical ability and self-efficacy among students at SD Inpres Morowa, as evidenced by students' difficulties in understanding basic mathematical concepts, lack of active participation in learning, and low self-confidence in solving mathematical problems. Therefore, the purpose of this community service activity is to improve students' mathematical abilities through the implementation of reciprocal teaching reinforced with self-efficacy development. The method used is peer teaching with a collaborative approach involving 19 fourth-grade students. This activity was carried out in three stages: preparation, implementation, and evaluation. The results of this activity show a significant improvement in students' mathematical abilities and an increase in students' self-efficacy, as seen in the increased self-confidence, activeness, and ability to explain mathematical concepts to peers.
                        
                        
                        
                        
                            
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