his research is carried out to obtain the empirical evidence concerning capability of discovering to raise the mathematical power and disposition of senior high school students (SMA). The population in this research is Senior High School Students, with sampel is SMA students from high level, medium level and lower level in environment in Education Departement in Bandung. This research just using research of control group design especially post-test. To knowing ability of disposition and power mathematical student used by the instrument test. Analysis data in this research using one way and two way ANOVA. The research result obtained as follows:(1) The mathematical power and disposition of student study which is use the study model of investigation that better than the student which is use study conventionally. (2) The mathematical power and disposition of student which is using model study of investigation grouply better than that student study use the model study of investigation individually. (3) The mathematical power and disposition of student has the cognitive style field independent (FI) better than student has the cognitive style field dependent (FD). (4) There are interaction between study models with level to school in mathematical power. (5) There are interaction between study model with cognitive style. (6) There are interaction between study models with level to school in mathematical disposition. (7) There are no interaction between study models with cognitive style in mathematical disposition. Key Words: Mathematical power, mathematical disposition, Cognitive Styles, problem solving, communication, reasoning, connections, and group investigation.

Menumbuhkembangkan daya dan disposisi matematis siswa sekolah menengah atas melalui model pembelajaran investigasi

Since Indonesian students’ critical thinking skills in junior high school is still in unexpected level, it should be improved through teaching and learning process. The objective of the study is finding out the influence of problem centered learning approach toward students’ mathematical critical thinking ability. Every student should have mathematical critical thinking skills to make mathematics lessons are easier. Using the critical thinking skills will help students improving problem solving skills. However, the current critical thinking ability of junior high school students is still low. This research used quasi experimental design with Static Group Comparation type. The research sample consisted of two classes with each class of 35 students. The research instrument consists of six questions which indicate a mathematical critical thinking ability. Data analysis of this study used the Mann-Whitney test. The results of the study indicate that there is an effect of the problem-centered learning approach on the students' mathematical critical thinking ability with testing criteria is high.

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The Effect of a Problem Centered Learning on Student’s Mathematical Critical Thinking

Selection of appropriate learning approaches and strategies, will facilitate the achievement of these learning activities. Similarly, in mathematics learning activities in PGSD (department of elementary school preservice teacher), which is demanding the development of a high level of mathematical ability as well as critical thinking skills. However, not many people are trying to look for other factors in addition to the approach/learning strategy, which is possible to contribute to the development of critical thinking skills, such as interest factor majors students (IPA [science] and non-IPA [non-science]) as well as mathematical prior knowledge which has been owned previously. In addition, affective aspects that accompany any critical thinking skills (critical disposition) is a study that is still rare. This paper briefly present to peel the election factor of approaches and learning strategies, ie, problem based learning with "MURDER" strategy, shared interests and their interaction majors and mathematical prior knowledge of the result of performance of critical thinking skills and dispositions of PGSD students. Keywords : problem-based learning, the "MURDER" strategy, mathematical prior knowledge, critical thinking skills, critical thinking disposition.

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Interaksi pbl-murder, minat penjurusan, dan kemampuan dasar matematis terhadap pencapaian kemampuan berpikir dan disposisi kritis

Kemampuan pemecahan masalah dan disposisi matematis merupakan sebuah tujuan pembelajaran yang penting untuk dikembangkan di Sekolah Dasar. Namun, fakta dilapangan menunjukkan masih rendahnya kemampuan pemecahan masalah dan disposisi matematis. Berdasarkan hal tersebut perlu adanya sebuah intervensi, atau upaya perbaikan dengan bantuan pembelajaran Problem-Centered Learning. Pendekatan ini merupakan sebuah kegiatan yang menjadikan masalah sebagai kegiatan yang dikerjakan siswa. Tujuannya, untuk melihat pengaruh dari pembelajaran Problem-Centered Learning . Yang menjadi subjek penelitian adalah seluruh siswa di kecamatan Darmaraja. Sampel yang diambil adalah SDN Kebonbuah dan SDN Pataruman. Instrumen yang digunakan adalah soal tes kemampuan pemecahan masalah,.angket.disposisi.matematis, .format observasi dan wawancara. Berdasarkan hasil penelitian pendekatan Problem-Centered Learning berpengaruh secara signifikan pada kemampuan pemecahan masalah dan disposisi matematis.

Aida Azizah

Papers

Pengaruh pendekatan problem-centered learning terhadap kemampuan pemecahan masalah dan disposisi matematis siswa