Özet:

This study aimed to determine the improvement of students' mathematical reasoning abilities through sociohumanistic-based learning. This research was a quasi-experimental study with a non-equivalent control group design. The population in this study were all class IV in one elementary school in Salatiga. The sample consisted of two classes, namely classes and selected by purposive sampling. The instrument used was a mathematical reasoning ability test. Data analysis used t-test (Independent Sample t-Test) and Mann Whitney. The analysis results show that: (1) based on the results on a limited, medium, and wide-scale try-out, the developed model is easy-practical-effective in its implementation; (2) the improvement in mathematical reasoning skill of the students taught using the model is higher than that of taught using direct instructions; and (3) Sociohumanistic-based learning has several advantages especially can generate endorphins (hormone of happiness) to make the students love math, can foster self-reliance of learners, able to activate the storage capabilities of the human brain into long-term memory. Based on the results of this research and development, it can be concluded that the developed model is easy, practical, and effective to improve the mathematical reasoning skill of elementary school students.

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