Developing proportional reasoning problem like PISA with “choosing services” context

Abstract

Abstract This study aims to produce the valid mathematic problems like proportional reasoning in PISA question. The research involved seventh-grade students in one of the junior high school in Palembang. The methodology of this research is a design research with development studies type that consist of preliminary and formative evaluation stage. This article just only discuss validation of problems process and data about student strategies in one to one process. The data collection techniques used walktrough, documentation, observation and interview. The validity of the problems discovered from expert review in validation process. Problems validated based on content, problem has been accord to ratio and proportion learning in seventh-grade, construct, the problem require the student’s proportional reasoning and accord to abilities of the seventh-grade students; and language, the problems use of enhancing spelling, could be understood, and didn’t have variety of meanings. The result show that problems are designed using the context of choosing services can indicate how student’s proportional reasoning. Problems developed indicate that students had different strategies and do not refer to the proportion formula, but with reasoning and the use of a ratio table.