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Mathematical reasoning is a tool for understanding mathematical concepts by developing solutions to problems with the answers and abilities they have. This research aims to analyze mathematical reasoning abilities in the quadratic function material of junior high school students in terms of Initial Mathematics Ability (IMA) The method used in this research is descriptive qualitative. The research subjects were students of SMP Negeri 6 Semarang class IX B consisting of 6 students selected from 32 students based on Initial Mathematics Ability (IMA). The data collection technique is through a written test in the form of 2 descriptive questions on mathematical reasoning ability. The results of this research are: (1) Students who have high Initial Mathematical Ability (IMA) can fulfill all ability indicators and aspects of mathematical reasoning ability, (2) Students who have moderate Initial Mathematical Ability (IMA) can only fulfill indicators 2 and 3, as well as some indicators 1 and 4, and (3) students who have low Initial Mathematical Ability (IMA) meet indicator 1 and indicator 2. These results show that different Initial Mathematical Abilities (IMA) have different mathematical reasoning abilities.
Imkhala et al. (Fri,) studied this question.