<![CDATA[The purpose of the study was to analyze the effectiveness of the Problem Based Learning model based on manipulative teaching aids on the understanding of mathematical concepts and the self-confidence of elementary school students.The research method used is experimental research methods. The research design used is a pre-experimental one group pre-test-posttest design. In this study, the sample was grade VI SDN 1 Kangkung Demak students. The independent variable in this study is Problem Based Learning with manipulative teaching aids and the dependent variable is understanding mathematical concepts and students' self-confidence. Data collection uses observation to obtain data about students' self-confidence. The researcher used a questionnaire/questionnaire technique to obtain data on the PBL learning model with manipulative teaching aids in mathematics. The test instrument is in the form of a description of 10 questions, meanwhile a questionnaire is used to collect research data about the level of students' self-confidence.The results showed that based on the t-test, the t-value was 23,359, while the t-table with df=43 was 2.0195, the t-count t-table (23,359 2.0195), which means that the PBL model based on manipulative teaching aids is effectively used to increase the self-confidence of elementary school students. The effectiveness of PBL learning based on manipulative teaching aids is proven to increase students' understanding of mathematical concepts and self-confidence.]]>
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