<![CDATA[This study aims to determine the use of Group Investigation (GI) model of the critical thinking skills of class V students in Thematic learning at SDN Gugus XII Kota Bengkulu. This type of research is quantitative research. The method of this research is experimental research. The design in this research is The Matching Only Pretest-Postest Group Design. The population of this research is class V SD Negeri Gugus XII Kota Bengkulu applying Curriculum 2013 consists of 3 elementary schools, SD Negeri 20, SD Negeri 99, and SD Negeri 81 Kota Bengkulu. The sample used cluster random sampling technique. Class obtained by VA class of SD Negeri 81 Kota Bengkulu as experiment class 26 students and class of VA SD Negeri 99 Kota Bengkulu as control class 36 student, and class VI SD Negeri 20 Kota Bengkulu as class of instrument of fire of 29 students. The research instrument is a critical thinking skill test related to the description. The result of t gain test of score found titung equal to 7,91 bigger than ttable price equal to 2,00 significant using Group Investigation (GI) model to critical thinking ability of student. Based on the hypothesis test, it is found that: there are factors that use Group Investigation (GI) to the critical thinking ability of class V students in Thematic learning at SDN Gugus XII Kota Bengkulu. Keywords: Critical Thinking, Group Investigation, Thematic Learning]]>
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