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Abstrak :
Learning achievement of Mathematics among Universitas Terbuka (UT) students generally are less satisfactory. A Mathematics tutorial model by using lesson study is measured based on the validity, practicality and effectiveness in improving the quality of the tutorial. The study was conducted in Surabaya. The respondents consist of Mathematics learning experts, Mathematics lecturer, tutors and UT's elementary school education students. The results showed that TMLS model and its learning instruments meet the criteria of Validity, practicality and effectiveness. It can be seen from the results of the implementation TMLS model that showed some advantages, such as (a) good response of the students toward TMLS model, (b) the TMLS model was suitable with the tutorial basic principle that is “students independence”, (c) the TMLS model increased students' mastery and thinking level at the mathematic modules, (d) the TMLS model had motivated students to be active in finding the deeper understanding of the subjects, (e) the TMLS model had motivated students students to improve their meta cognitive knowledge, (f) The tutor's role in the implementation of the TMLS model had motivated the students to be active in learning and developing their mathematics communication.

Abstrak :
Manipulative materials is one of equipment that can be used for teaching mathematics concept to students at elementary schools. Hopefully the students have the skill to compute mathematics by fun. This research used to teach concept of addition and subtraction in grade five at public. Elementary Schools in Kecamatan Mandiangin Koto Selayan Bukittinggi. For collecting data, the respondents were given a test after learning the subject matter. The data processing was used the hypotesis test o mean of population by using software Minitab. Based on the data analysis this experiment show that (p<0,05) which means the difference of result of the test was significant. It concluded that the result of test of experiment group is better that control class.

Abstrak :
This study examines whether students’ ability in mathematical writing and understanding gained from teaching through ‘think talk write’ strategy is better than students’ ability gained from conventional one. This study also examines students’ ability in mathematical writing and understanding from gender aspects. Using quantitative design, data was taken through documentary study, questioner sheets and observation. Data was analyzed using two ways ANOVA. Result show: a) the ability of students in mathematical writing and understanding gained from teaching using ‘think talk write’ strategy is better than the ability gained from conventional one; b) the ability of female students is better than male students; and c) Think Talk Write strategy can improve students’ mathematical disposition ability.

Abstrak :
Universitas Terbuka (UT) sebagai perguruan tinggi yang menerapkan sistem belajar jarak jauh menyusun kurikulum program pendidikannya berbeda dengan perguruan tinggi yang mempunyai sistem belajar tatap muka. Mahasiswa UT diberikan kebebasan dalam memilih dan menentukan mata kuliah untuk diregistrasikan pada satu semester. Dalam kurikulum program studi di UT terlihat bahwa terdapat mata kuliah yang mempunyai hubungan keterkaitan materi antarmata kuliah. Hubungan tersebut digambarkan sebagai hubungan prasyarat antarmata kuliah. Untuk membuat rencana studi, mahasiswa perlu mengetahui hubungan keterkaitan materi antarmata kuliah tersebut sehingga dapat menentukan mata kuliah yang akan diregistrasi pada satu semester. Artikel ini mengidentifikasi keterkaitan materi antarmata kuliah untuk dipetakan dalam rencana studi. Untuk memetakan mata kuliah berprasyarat tersebut perlu dilakukan optimasi pemetaan mata kuliah. Tujuan pengembangan model optimasi ini adalah untuk memaksimalkan hubungan keterkaitan materi dengan memetakan mata kuliah berprasyarat secara berurutan. Hal ini juga berarti meminimalkan jarak antarsemester urutan mata kuliah berprasyarat. Model optimasi yang dikembangkan berupa Integrasi Linear Programming. Model tersebut kemudian diimplementasikan pada kurikulum Program Studi Matematika FMIPA UT. Hasil simulasinya berupa rencana studi bagi mahasiswa program studi tersebut. Dari analisis hasil simulasi diperoleh rencana studi dengan jumlah maksimal 21 dan 23 SKS per semester merupakan pilihan terbaik bagi mahasiswa.

Abstrak :
Penelitian ini bertujuan meningkatkan kemampuan komunikasi matematik siswa SMP dengan menerapkan pembelajaran kontekstual berbasis potensi pesisir (CCTL). Penelitian dilaksanakan pada siswa kelas VIII SMPN 1 Kapontori dan SMPN 1 Batauga Sulawesi Tenggara, Indonesia. Pada setiap sekolah diambil dua kelas (eksperimen dan kontrol) secara acak. Siswa kelas eksperimen mendapat pembelajaran CCTL dan siswa kelas kontrol kemampuan komunikasi matematik, lembar observasi, dan hasil wawancara dengan siswa dan guru. Data dianalisis secara deskriptif dan inferensial dengan menggunakan uji-t dan ANAVA dua jalur. Hasil analisis data menunjukkan bahwa pembelajaran CCTL secara signifikan lebih efektif digunakan untuk meningkatkan kemampuan komunikasi matematik siswa daripada pembelajaran konvensional.

Abstrak :
Estimasi adalah salah satu topik matematika, terutama untuk SD. Topik ini berguna tidak hanya untuk matematika canggih tetapi untuk memecahkan masalah di kehidupan sehari-hari. Guru jarang mengajarkan topik ini karena mereka hanya melewatkan materi ini atau materi ini tidak dibahas dengan baik oleh penulis. Penelitian ini melaporkan kemampuan guru SD dalam membuat estimasi dan hubungan antara kemampuan komputasi. Penelitian deskriptif ini dilakukan terhadap 15 guru SD. Kemampuan pada perhitungan adalah 18 poin lebih tinggi daripada estimasi. Hal ini menunjukkan bahwa mereka memcahkan tugas komputasi secara mekanis daripada secara bermakna.

Abstrak :
This study attemps to determine impact of the implementation of Realistic Mathematics Education (RME) model on the improvement of deductive reasoning ability, and to describe the perceptions of teachers and students of secondary schools toward the RME model. A quasi-experiment with pretest-postest non-equivalent group as research design was employed into 2 groups of research subjectL the experimental group and the control group and each was treated under RME and conventional teaching model. A number of 44 students of SMPN1 Parung and 20 students of SMP Islam Terpadu Jabon Mekar in Parung district were chosen as research subjects. Quantitative data obtained through questionnaries and written test were analyzed using student-t test. While qualitative information gathered through responses to personal interview and observations was analyzed using qualitative-naturalistics method. Findings reveals that learning mathematics using the RME model impacts on increasing students' deductive learning ability in both schools with amount of increase is 30.7 for SMP Islam Terpadu and 44.8 for SMPN1 Parung. RME model also impacts on developing students' positive attitude of students toward mathematics as seen in the number of students who liked mathematics lesson, that is 100% for SMP Islam Terpadu and 97% SMPN 1 Parung. The perceptions of teachers and students in both schools toward the RME Model are positive. Application of learning mathematics using PMR model becomes more enjoyable and students become more active.

Abstrak :
The research purpose was to describe the succesulness of Realistic Mathematic Education Model which was based on the completion aspect of students' learning result, students' actively level, teacher's ability to manage learning, and students' response toward the model applied in this research. This research was conducted toward the third year students of SD Islam Terpadu which consist of 25 students. In gathering data, pen and paper test technique was used to measure students' achievement. Observation was done to know the students' activities and teacher's ability in manage learning. Questioner was also given to know the students' perceptions toward the model applied. Statistic and descriptive analysis were used to analyze the data. The research finding showed that the students' activities were not effective, while the teacher's ability in managing learning was effective. In the end, standard for students' achievement were not reached. On the other hand, students' responses toward the model applied were positive.

Abstrak :
This book, resulting from the 19th ICMI Study, brings together a variety of viewpoints on issues such as : (1) the potential role of reasoning and proof in deepening mathematical understanding in the classroom as it does in mathematical practice, (2) the developmental nature of mathematical reasoning and proof in teaching and learning from the earliest grades, and (3) the development of suitable curriculum materials and teacher education programs to support the teaching of proof and proving.