This study aims to analyze the Application of Group Investigation (GI) Learning Model Assisted by Quizizz to Improve Mathematics Learning Outcomes The subjects are students of class VIIA SMP Negeri 4 Madiun. The type of research used is classroom action research. The background of this study is because based on observations that have been made, teachers tend to use the convensional model so that it is less effective in learning because of the lack of interaction with students which has an impact on learning outcomes that are not optimal. So the researcher aims to apply the Group Investigation learning model with the help of quizizz. The implementation of this research with a spiral model starting from planning, implementation, observation and reflection. The results showed that the completeness and learning outcomes reached 80.64% exceeding the set completeness and with a good category. Cycle I shows the percentage of completeness of student learning outcomes of 70.96% with an average of 78 with a sufficient category. Cycle II experienced an increase in the percentage of completeness of learning outcomes of 80.64% with an average of 85 with a good category. Therefore, PTK on the application of the Group Investigation learning model with the help of quizizz to improve the learning outcomes of students in class VII SMP Negeri 4 Madiun is declared successful. Keywords: Group Investigation, Quizizz, Learning Outcomes
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