Abstrak. Kemampuan pemahaman konsep matematis siswa dalam pembelajaran matematika diharapkan dapat berkembang secara optimal. Namun, kemampuan pemahaman konsep matematis siswa di SMP Negeri 13 Padang belum berkembang secara optimal. Hal ini terlihat dari hasil belajar siswa dimana hanya terdapat dua kelas dari delapan kelas yang memiliki jumlah siswa yang tuntas lebih tinggi daripada siswa yang tidak tuntas. Kriteria Ketuntasan Minimal (KKM) yang ditetapkan oleh sekolah yaitu 75. Pada proses pembelajaran matematika di SMP Negeri 13 Padang, siswa masih belum terlibat aktif dalam proses pembelajaran. Salah satu upaya untuk meningkatkan kemampuan pemahaman konsep matematis siswa adalah dengan menerapkan model Contextual Teaching and Learning (CTL). Penelitian ini menunjukkan bahwa pemahaman konsep matematis siswa yang belajar dengan menggunakan model CTL lebih baik daripada siswa yang menggunakan pembelajaran konvensional. Kata Kunci: Pemahaman konsep matematika, pembelajaran matematika, model Contextual Teaching and Learning

The purpose of this research is to analyse the mathematical communication skill of student by using essay test. The method of this research is a quantitative approach with descriptive. We assess the communication skill from the students who take calculus course. The results showed the percentage of achievement of mathematical communication skill indicators of students were: 1) 45.7% students can express mathematical ideas in oral or written form into images, algebraic expressions, and graphics; 2) 34.3% students can state mathematics problem in daily life into a symbol or model in mathematics; and 3) 51.4% students can interpret figures into mathematical ideas. Based on the percentage, the mathematical communication skills of students in calculus course is still low and need to be improved for further research.

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Objective of this study is to increase students’ critical thinking skills through geometry instructional device based on Van Hiele’s theory. Instructional devices developed include lesson plans and student worksheet based on Van Hiele’s theory. The stages of instructional are integrated with the stages of learning Van Hiele’s theory which consists of five stages, namely information, direction orientation, explication, free orientation, and integration. The development model used is adapted from the Plomp model which consists of three phases, namely the initial investigation phase, the prototype development phase, and the assessment phase. The subjects of this study were grade VIII students of SMP 13 Padang. The results of the research obtained showed an increase in indicators of mathematical critical thinking abilities of students using geometry instructional devices based on Van Hiele’s theory.

This research was conducted because the students' self-efficacy in mathematics was still low. The Brain Based Learning approach is expected in solving this problem. The purpose of this study was to determine and analyze the increasing in self-efficacy of students who received the Brain Based Learning (BBL) approach in mathematics. This study is a quasi-experimental study with a nonequivalent control group design. The population of this study were all students of grade VII at a junior high school in Padang City. The sample was determined by purposive sampling technique. The data collection instrument in this study was a non-test (questionnaire). Questionnaires are used to measure students' mathematical self-efficacy. The questionnaire is based on indicators of self-efficacy. The self-efficacy questionnaire consists of 28 questionnaire items. The questionnaire was given before being given treatment and after being given treatment. The treatment given was in the form of mathematics learning based on the BBL approach. The result of this study is that the increase in self-efficacy of students who get the BBL approach learning is significantly better than learning with the conventional approach as a whole.