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Abstract

21st century education must facilitate distance learning, and students are required to have critical thinking and problem-solving skills. Therefore, it is important to develop technology-based mathematics learning media in practicing critical thinking and problem-solving skills. This type of research is development research with a quantitative approach. The development phase consists of 6 phases: initiation, specification, design, production, review and evaluation, delivery and implementation. The selection of research subjects were 36 students of class V, 27 students of class IX, and 30 students of class XII. The research instruments are observation sheets, interviews, response questionnaires, and critical thinking and problem-solving tests. Analysis of the validity and practicality of PHET media developed with the validities of media products and materials, as well as analysis of student response questionnaire analysis. The analysis of the effectiveness of the media with the analysis of critical thinking skills and problem solving. The development of PHET Media which was developed through the following stages: (a) Adapting to the 2013 curriculum, choosing materials where students' critical thinking and problem solving skills are still low, namely fractional material, number patterns, three dimensions, as well as analyzing the extent of students' abilities, and making PHET media that easy to operate; (b) Prepare storyboards; (c) Choose characters that match the characteristics of students at each level, colors that can increase enthusiasm for learning, and sound effects; (d) Making PHET media with Unity; (e) Assessment by the validator that PHET media and instruments are valid and reliable; (f) Implementation of media for each level is obtained if PHET media is practical. The application of PHET media to students is also said to be effective because it can train critical thinking skills with test results in the medium and high categories.

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