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This study aims to (1) develop a media model based on hands-on activity and instrument to improve conceptual understanding. (2) conducting an instrument test to improve conceptual understanding abilities. The research method is used of this study is developmental research which is conducted by thought experiment and instruction experiment. The population of this study is the seventh-grade students of SMP Bandung. The results of trials of 210 junior high school students from 6 schools that have obtained flat building materials are obtained as follows: (1) all items about multiple choice conceptual understanding and validity test developed valid, (2) multiple choice questions conceptual understanding and description test developed reliable, (5) 90 mathematics teacher’s opinion on hands-on activity-based media model developed to construct a conceptual understanding of students.

Development of media model based on hands-on activity to improve conceptual understanding abilities of junior high school students in Bandung district