This study aims to determine the effect of the Think Pair Share model on students' critical thinking skills in the Science subject (IPAS) for Grade V at SD Negeri 53 Palembang. The research method used is quantitative with a type of Quasi-Experimental Design, employing a Nonequivalent Control Group Design involving two groups: an experimental group (treated with the Think Pair Share model) and a control group (without the treatment). The research subjects were students from classes VA and VB. The instrument was validated by subject matter experts. Data collection techniques included tests and documentation, while data analysis was conducted using the Independent Sample t-test. The analysis results showed that the t-count = 23.111 was greater than the t-table = 1.998 at a 0.05 significance level (df = 62), with Sig. (2-tailed) = 0.005. This indicates that the Think Pair Share model has a significant effect on students' critical thinking skills. Data processing was carried out using SPSS version 25.
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