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Abstract

The aim of this research is developing student activity sheets (LKS) with model problem creating to improve students’ ability to think critically. This research is a developmental research with Plomp’s development model. This development model consists of three stages that are (1) preliminary research; (2) prototype phase; (3) assessment phase. The test subjects involved 27 students of class VIII of SMPN 1 Gambut. Based on the results of research from the design of LKS consists of cover, time allocation, learning objectives, content of LKS and assessment. Activities in the LKS consists of five stages of model problem creating that are learning objectives, problem context, create the problem, anticipate students’ solutions and reflect. The contents of the LKS consists questions that guide students to find mathematical concepts or principles, issues that need to be spent students and guide students to critical thinking that are basic clarification, basic for decision, inference and advanced clarification. The validations results from three validators showed that the LKS satisfied valid criteria. As a result on field testing in SMPN 1 Gambut students’ responses were positive. In addition, this learning instrument can increase students’ ability to think critically by 74%.

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