Developing problem based learning to improve students’ critical thinking skill in integrated thematic learning at elementary school

This writing aims to be able to develop LKPD based on Project Based Learning (PjBL) which is suitable for use to improve students' critical thinking skills in integrated thematic learning in grade IV and also to analyze the effectiveness of LKPD based on Project Based Learning (PjBL) in improving skills students' critical thinking in integrated thematic learning in Class IV. This is a descriptive piece employing a quantitative approach. This is an example of R&D (Research and Development) writing. Sampling at the time of writing using a method of purposive sampling. At the time of writing, the population consists of fourth graders from SD Negeri 2 Pinang Jaya Kemiling Bandar Lampung. Data collection at this writing uses documentation techniques, written assessments, and questionnaires. Using SPSS 24.0 for Windows and a significance level of 0.05, the instrument used in this paper has been evaluated for validity and reliability. In addition, the data were analyzed using an independent sample test. The result shows that PjBL-based LKPD products have influence and are suitable for use in enhancing students' critical skills in thematic learning, specifically material experts of 0.97 (very valid), media experts of 0.95 (very valid), and linguists of 0.96 (very valid) and the devised PjBL-based worksheets are efficacious with a posttest score of 0.56 and a pretest score of 0.21.