<![CDATA[This study aims to determine the differences in the effectiveness of the Problem Solving and Group Investigation learning models for the improvement of critical thinking in Mathematics IV grade elementary school students. The subjects of this study were SDN Dukuh 05 with 21 students as the experimental class I and SDN Dukuh 02 with 30 students as experiments II. This type of research uses quasi-experimental. Before doing the research, a prerequisite test was conducted. The prerequisite test in this study shows that both experimental classes are homogeneous and normally distributed. The Independent Sample Test t test shows t count> t table which is 3.970> 3.1824 and significant with 0,000 <0.05 which means H0 is rejected and Ha is accepted. For the N-Gain score analysis that there is an increase after applying the Problem Solving model of 0.47, while after applying the Group Investigation model it is 0.36. This shows that there is a significant difference in effectiveness. And it can be concluded that the Problem Solving learning model is more effective than the Group Investigation learning model for improving critical thinking skills of fourth grade students.]]>
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