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The purpose of this research was to develop mathematics learning media which were valid, practical, and effective. The mathematics learning media which was developed in this study consisted of mathematics instructional media which the topics was circle. Data were collected by using observation sheet of instructional media implementation, student's and teacher's response questionnaire, and test of students learning outcomes. The collected data analyzed descriptively. The result of this research showed that the mathematics instructional media were categorized very high in validity, had fulfilled the practicality and the effectiveness aspects. The characteristics of the instructional media are: (1) practical usage; (2) learning activities were guided students to think critically and creatively; (3) exercises and real problems gave students the opportunity to think about alternative solutions to solve problems; and (4) provide variations in the learning.
Ni Made Dwijayani (Tue,) studied this question.