One of the important affective factors for students in mathematics learning is self-efficacy. The students should have high mathematics self-efficacy. So, it can support the success of learning process. The facts that indicated the low of students’ mathematics self-efficacy, encouraging the efforts to improve self-efficacy through the improvement of the learning process. One of them is by applying the problem based learning approach. This research was a classroom action research by applying problem based learning approach to improve students’ mathematics self-efficacy. The classroom action research was done in two cycles. Each cycle consists of planning, action, observation, and reflection. The findings of this research revealed that the problem based learning approach could improve student’s mathematics self-efficacy. At the end of the first cycle, the students’ mathematics self-efficacy was still in the medium category and increased at the end of the second cycle, which students’ mathematics self-efficacy has been in high category.

<p class="0abstract"><strong>Abstract—</strong>21st Century teaching and learning strategies related to the various methods used include the use of appropriate tools with the latest technological developments to help students to understand clearly about the content of the subject. Therefore, the need for the 21st Century teaching more focused on the development of students' higher-order thinking skills is increasingly urgent. This study aims to develop mathematics learning media based on e-learning using MOODLE (Modular Object-Oriented Dynamic Learning Environment) software on the geometry of the flat side subject to improve higher-order thinking skills among secondary school students. The analysis in this study is based on the ADDIE Instructional Model (Analysis, Design, Development, Implementation, Evaluation). The respondents in this study were three lecturers who are experts in the field of mathematics education, three teachers in the field of information technology and 70 secondary school students in Yogyakarta, Indonesia was selected using the purposive sampling method. The findings of this study have shown that mathematics learning media based on e-learning using MOODLE very suitable for encouraging students to use the mind to understand, interpret, analyze and manipulate information to find possible solutions for various problems, especially related to the geometry of the flat side subject. Besides, based on mathematics learning media based on e-learning using MOODLE able to encourage students to think, to generate new ideas, to focus and to be active throughout the teaching and learning activities. The results of this study are expected can be one of the teaching tools which can help in learning activities and a catalyst for the improvement of the quality of students' thinking.</p>

The current study aims to identify the development level of students’ geometric thinking in mathematics education department, Universitas Ahmad Dahlan based on van Hiele’s theory. This is a descriptive qualitative research with the respondents as many as 129 students. In addition to researchers, the instrument used in this study is a test consisting of 25 items multiple choice questions. The data is analyzed by using Milles and Huberman model. The result shows that there were 30,65% of students in pre-visualization level, 21,51% of students in visualizes level, and 29,03% of students in analyze level, 16,67% of students in informal deduction level, 2,15% of students in deduction level, and 0,00% of student in rigor level. Furthermore, findings indicated a transition level among development levels of geometric thinking in pre-analyze, pre-informal deduction, pre-deduction, and pre-rigor that were 20%; 13,44%; 6,45%; 1,08% respectively. The other findings were 40,32% of students were difficult to determine and 4,3% of students cannot be identified.

AbstrakMetakognisi adalah kesadaran seseorang tentang proses berpikirnya untuk merencanakan, mengamati, dan mengevaluasi. Selain itu, kecerdasan siswa memiliki peran penting untuk menyelesaikan masalah. Tujuan dari penelitian ini adalah untuk mengetahui proses metakognitif siswa dalam rangka menyelesaikan masalah matematika yang ditinjau dari kecerdasan intrapersonal mereka. Penelitian ini menggunakan pendekatan deskriptif kualitatif. Subyek ini terdiri dari tiga jenis siswa yang memiliki kecerdasan intrapersonal tinggi, rata-rata, dan rendah. Instrumen yang digunakan adalah kuesioner, tes pemecahan masalah matematika (TPMM) dan wawancara. Data dianalisis dengan menggunakan reduksi data, penyajian data, dan penarikan kesimpulan. Hasil penelitian menunjukkan bahwa subjek yang memiliki kecerdasan intrapersonal tinggi dalam menyelesaikan masalah matematika melakukan perencanaan, pengamatan, dan evaluasi kegiatan di setiap tahap polya. Subyek intelijen interpersonal rata-rata berada di tahap memahami masalah, mengatur dan menerapkan rencana pemecahan masalah. Mereka telah melakukan semua kegiatan metakognitif, tetapi tidak melakukan perencanaan, mengamati, dan mengevaluasi kegiatan di tahap crosschecking. Subjek kecerdasan intrapersonal rendah berada di tahap memahami masalah, perencanaan, pengamatan, dan evaluasi. Namun, dalam mengatur penyelesaian masalah, mereka hanya melakukan perencanaan dan pengamatan tanpa mengevaluasi. Dalam tahap menerapkan rencana pemecahan masalah, mereka hanya melakukan perencanaan tanpa mengamati dan mengevaluasi. Selain itu, mereka tidak melakukan kegiatan metakognitif dalam tahap evaluasi. AbstractMetacognition is the awareness of someone about his thinking process in order to plan, observe, and evaluate. Besides, the student’s intelligence has an important role to accomplish the problem. The objective of this research is to know the students’ metacognitive process in order to accomplish mathematic problem reviewed from their intrapersonal intelligence. This research used descriptive qualitative approach. The subject consists of three kinds of students who have high, average, and low intrapersonal intelligence. The instruments are questionnaire, mathematic problem solving test (TPMM) and interview. The data were analyzed by using reduction of data, presentation of data, and conclusion. The result showed that the subject who has high intrapersonal intelligence in accomplishing the mathematic problem did planning, observing, and evaluating activities in every polya stage. The average interpersonal intelligence subject was in the stage of understanding the problem, arranging and implementing the problem solving plan. They had done all metacognitive activities, but did not do planning, observing, and evaluating activities in the crosschecking stage. The low intrapersonal intelligence subject was in the stage of understanding the problem, planning, observing, and evaluating. However, in arranging the problem solving, they only did planning and observing without evaluating. In the stage of implementing the problem solving plan, they only did the planning without observing and evaluating. In addition, they did not do metacognitive activities in the evaluation stage.

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The current study aims to identify the development level of students' geometric thinking in mathematics education department, Universitas Ahmad Dahlan based on van Hiele's theory. This is a descriptive qualitative research with the respondents as many as 129 students. In addition to researchers, the instrument used in this study is a test consisting of 25 items multiple choice questions. The data is analyzed by using Milles and Huberman model. The result shows that there were 30,65% of students in pre-visualization level, 21,51% of students in visualizes level, and 29,03% of students in analyze level, 16,67% of students in informal deduction level, 2,15% of students in deduction level, and 0,00% of student in rigor level. Furthermore, findings indicated a transition level among development levels of geometric thinking in pre-analyze, pre-informal deduction, pre-deduction, and pre-rigor that were 20%; 13,44%; 6,45%; 1,08% respectively. The other findings were 40,32% of students were difficult to determine and 4,3% of students cannot be identified. AbstrakPenelitian ini bertujuan untuk mengidentifikasi level perkembangan berpikir geometri mahasiswa prodi pendidikan matematika UAD berdasarkan teori van Hiele. Pendekatan penelitian yang digunakan adalah deskriptif kualitatif dengan jumlah responden sebanyak 129 siswa. Selain peneliti, isntrumen yang digunakan dalam penelitian ini adalah tes yang terdiri dari 25 butir soal pilihan ganda. Analisis data menggunakan model Milles dan Huberman. Hasil penelitian menunjukkan bahwa terdapat 30,65% mahasiswa pada level pravisualisasi, 21,51% mahasiswa pada level visualisasi, 29,03% mahasiswa pada level analisis, 16,67% mahasiswa berada pada level deduksi informal, 2,15% mahasiswa pada level deduksi, dan 0,00% mahasiswa pada level rigor. Selain itu, ditemukan terdapat level transisi di antara level perkembangan berpikir geometri berturut-turut dari pra analisis, pra deduksi informal, pra deduksi dan pra rigor yaitu 17,20%; 13,44%; 6,45%; 1,08%. Temuan lainnya lagi adalah sebanyak 40,32% mahasiswa sulit diklasifikasikan dan 4,3% mahasiswa tidak bisa diklasifikasikan.

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