In this research, justification ability is viewed from four indicators, namely the ability to develop mathematical arguments (proving), the ability to analyze (basic level), the ability to generalize, the ability to make decisions which are first analyzed for their initial mathemat-ical abilities which are divided into three categories, namely high, medium and low levels. . The method used is quantitative with a quasi-experimental design, with division into ex-perimental classes and control classes. The results obtained from each sample based on the initial mathematical ability level category are the highest N-Gain sequence at high KAM (0.3943), followed by medium KAM (0.3600) and over all KAM (0.514) and finally low KAM (0 ,22470).
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