This study aims to improve the critical thinking skills of third grade elementary school students through the application of the Predict-Observe-Explain (POE) learning model based on simple practicum activities. This Classroom Action Research (CAR) used the Kemmis and McTaggart model and was implemented in two cycles at SD 4 Bulungcangkring, Kudus, involving 30 third-grade students (16 boys and 14 girls). Data were collected through written tests, observation, interviews, and documentation, then analyzed descriptively by comparing the class average score and the percentage of learning completeness across the pre-cycle, Cycle I, and Cycle II. The results showed that the average score increased from 53.62 (pre-cycle) to 71.33 (Cycle I) and 84.58 (Cycle II), while classical completeness rose from 6.67% to 50.00% and finally to 93.33%, exceeding the 70% success indicator. These findings indicate that the POE model based on simple practicum activities effectively enhances students' critical thinking skills of third grade SD 4 Bulungcangkring.
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