The research was conducted to find out the influence of Group Investigation (GI) of Cooperative Learning methods toward the studentâs ability of mathematical reasoning. The research design was quasi-experimental the nonequivalent posttest-only control group design consisting of one experimental class (Group Investigation of Cooperative Learning) and one control class. The research population was all the second-semester students of VIII grade of MTs Negeri 1 Lampung Timur in the academic year of 2015/2016. The research instruments used were mathematical reasoning ability test. Data Analyze mathematical reasoning ability was used independent sample t-test. The results showed that: (1) mathematical reasoning ability using Group Investigation of Cooperative Learning was higher than conventional learning.
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