DEVELOPMENT LEARNING DEVICE BASED FOR MEASURING CONTEXTUAL CRITICAL THINKING SKILLS STUDENTS SD CLASS VI MATHEMATICAL

Development research aims to generate a contextual based learning tools valid and practical to measure mathematical critical thinking skills of elementary school students, and knowing its potential effect on the ability of critical thinking mathematically SD Class VI 050611 Aman Damai student. Development of a model learning device refers Tessmer which consists of three stages: self evaluation, prototyping,and field test. Data collection was conducted by observation, documentation, and test. From the results of this development acquired learning device (lesson plans, worksheets and tests) material Volume Prisms Triangle and tube-based contextual that can be considered valid and practical, as well as having a potential effect in measuring critical thinking ability of students' mathematical which has not grown and familiarized.