摘要：The aims of this research are to improve the instruction effectiveness through the use of concrete media to the fith grade students of SD Timuran. This research is a classroom action research study consisting of two cycles, each of which follows the stages in Kemmis and Taggart model including: planning, action and observation, and reflection. The subjects of this research were 11 male student and 14 female students of SD Timuran Yogyakarta. The data were collected through observation, test, and questionnaires. The criteria of success were (1) the minimal average class score was 75, (2) a minimum of 75% students exceeded the minimum achievement criterion, and (3) a minimum of 75 % student gave a good response to the teaching. The results show that the use of the concrete media can improve the instruction effectiveness. It proves that the criteria of this research can be achieved, including: (1) the average of the test results increases, (2) the percentage of the students who exceed the minimum achievement criterion increases, and (3) the students’ responses to mathematics teaching using concrete media are in a good category.
其他摘要：Penelitian ini bertujuan untuk meningkatkan keefektifan pembelajaran melalui penggunaan media benda konkret pada siswa kelas V SD Timuran Yogyakarta. Penelitian ini merupakan penelitian tidakan kelas (PTK), yang terdiri atas dua siklus, yang setiap sikl
关键词：effectivenes; mathematics teaching; concrete media
其他关键词：keefektifan; pembelajaran matematika; media benda konkret
