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Abstract.The purpose of this research development is to develop guided inquiry-based worksheets on the material of Cubes and Beams in Class VII 22 State Junior High School. This research uses the Plomp development research model including the initial investigation phase (preliminary research), the development or prototype phase (development or prototyping phase), and the research phase (assessment phase). The LKS product test results show that the LKS developed on the material of Cubes and Beams are valid, effective and practical. So it can be concluded that this worksheet can be used in learning mathematics.