Developing Mathematics Learning Tools to Stimulate Critical Thinking

Abstract

The purpose of this research was to produce the valid mathematics learning devices to stimulate critical thinking. The developmental model used in this study was a model developed by Borg and Gall as a major developmental model. It was modified by Dick and Carey model and Kemp (1994: 9) model (Real Research and Development). The subjects of the study were senior year students in science (IPA) class from six state senior high schools in Pacitan. The data were collected through test, questionnaire, observation, and interview. The data were analyzed using content and descriptive analysis techniques. The result of the research consisted of module, lesson plan, student worksheet, and a mathematics test on geometry transformation material that had been validated. The analysis results showed that the product met the validity criteria, as indicated by the percentage of 100% of expert judgments included in the valid category thus the product is worth of using