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This study is a classroom action research that aims to improve students mathematical reasoning abilities through a demonstration learning approach. This research was motivated by observations in class VII of SMP Negeri 2 Cilawu, Garut Regency, that students mathematical reasoning ability in Mathematics subjects was very low, that is, the average of each indicator only reached 3.2. The subjects of this study were seventh grade students of SMP Negeri 2 Cilawu 2018/2019 academic year. This research was carried out in 3 cycles. Stages in each cycle included planning, action, observation, reflection. Instruments used to measure students mathematical reasoning abilities used a description test given at the end of each cycle. Based on the results of the study obtained data as follows: in cycle I students reasoning abilities gained an average of 45.25. In the second cycle obtained an average of 56.5. In the third cycle obtained an average of 68.75. So the authors conclude that with a learning approach demonstration of students reasoning abilities increases