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Papers by Rustam Simamora

ALGEBRA: Journal of Mathematics Education and Science, Jul 15, 2020

TIN: Terapan Informatika Nusantara, Apr 30, 2021

Penelitian ini bertujuan untuk mengetahui keefektivan penerapan model Guided-discovery learning d... more Penelitian ini bertujuan untuk mengetahui keefektivan penerapan model Guided-discovery learning dengan pendekatan saintifik berbantuan software GeoGebra serta sikap siswa didalam pembelajaran matematika pada topik Geometri. Jenis penelitian ini adalah Penelitian Terapan. Populasi penelitian ini adalah siswa SMA dan sampel penelitian ini adalah siswa Kelas XII. Hasil penelitian ini menunjukkan bahwa: penerapan model Guided-discovery learning dengan pendekatan saintifik berbantuan software GeoGebra pada topik Geometri akan efektif untuk membelajarkan siswa, penerapan model Guided-discovery learning dengan pendekatan saintifik berbantuan software GeoGebra pada topik Geometri akan membuat siswa bersikap positif pada pembelajaran matematika.

Journal of Honai Math

Inspiration plays a significant role in sparking or enhancing the learning motivation of prospect... more Inspiration plays a significant role in sparking or enhancing the learning motivation of prospective mathematics teachers (PMTs). Inspiration will also influence the mathematical identity of PMTs’ when they become professional mathematics teachers. A mathematics teacher educator (MTE) can be a source of inspiration for PMTs; hence, a study must identify and explain why an MTE is considered inspiring. This study attempts to develop the theory of inspiring MTEs profiles based on the experience of PMTs. This study included 21 students and 7 lecturers of the Mathematics Education Department in a public university in Indonesia. This qualitative research was conducted employing a grounded theory constructivist approach. The findings revealed that inspiring MTEs possessed the following characteristics: “creating a sense of comfort, being knowledgeable, being motivating, providing fun and enjoyable learning, imparting new insights and comprehension, and being disciplined and authoritative.”...

PARADIKMA: JURNAL PENDIDIKAN MATEMATIKA, Jun 15, 2019

Penelitian ini bertujuan untuk mengetahui apakah penerapan Model Pembelajaran Problem Based Learn... more Penelitian ini bertujuan untuk mengetahui apakah penerapan Model Pembelajaran Problem Based Learning (PBL) dapat meningkatkan aktivitas belajar dan kemampuan pemecahan masalah matematika siswa di kelas VIIB SMP Negeri 3 Medan yang berjumlah 30 orang. Jenis penelitian ini adalah penelitian tindakan kelas (classroom action research) yang berlangsung sebanyak dua siklus. Pengumpulan data dilakukan melalui tes dan observasi. Hasil penelitian pada siklus I menunjukkan bahwa nilai rata-rata observasi kegiatan peneliti adalah 2,9 dengan kategori baik, dan persentase aktivitas belajar siswa adalah 57% dengan kategori kurang aktif. Rata-rata nilai kemampuan pemecahan masalah adalah 4,87 dengan kategori sangat rendah. Hasil penelitian pada siklus II menunjukkan nilai rata-rata observasi 3,65 dengan kategori sangat baik. Persentase aktivitas belajar siswa adalah 79% dengan kategori aktif. Rata-rata kemampuan pemecahan masalah matematika siswa adalah 8,3 dengan kategori kemampuan tinggi. Hasil ...

International Electronic Journal of Mathematics Education, 2018

Rendahnya prestasi dan motivasi merupakan masalah yang sering dihadapi di bidang pendidikan Matem... more Rendahnya prestasi dan motivasi merupakan masalah yang sering dihadapi di bidang pendidikan Matematika. Penelitian ini bertujuan untuk mengeksplorasi bagaimana mahasiswa calon guru Matematika dalam mendapatkan titik pangkal atau titik balik sehingga terinspirasi untuk belajar Matematika. Temuan penelitian ini diharapkan dapat membantu penyelesaian masalah rendahya prestasi dan motivasi tersebut. Jenis penelitian ini merupakan studi kasus kualitatif. Subjek penelitian adalah mahasiswa pendidikan Matematika dengan kriteria tertentu. Hasil penelitian berdasarkan wawancara dan formulir menunjukkan bahwa inspirasi muncul ketika: siswa berkesempatan belajar dengan guru yang cakap dalam menjelaskan, penyabar, bersahabat dengan siswa, humoris, senang memberikan pujian dan hadiah ketika mendapat prestasi; timbul kesadaran dalam diri siswa bahwa siswa tersebut cakap dalam Matematika; muncul persepsi dalam diri siswa bahwa Matematika itu menantang; siswa menemukan sosok motivator dan panutan u...

International Journal of Sciences: Basic and Applied Research, 2017

The aim of this study to determined whether the implementation of Problem Based Learning Learning... more The aim of this study to determined whether the implementation of Problem Based Learning Learning (PBL) model could improve learning activities and problem solving skills of mathematics students in class VIIB SMP Negeri 3 Medan (Seventh Year Juniour High School), amounting to 30 students. The type of this study was a classroom action research that took two cycles. Data collection was done through tests and observations. The results of the research in the Cycle 1 showed that the average value of observation of the research activity was 2.9 with good category, and the percentage of student learning activity was 57% with less active category. The average value of problem solving ability is 4.87 with very low category. The results of the research in Cycle 2 showed the average value of observation 3.65 with very good category. Percentage of student learning activity was 79% with active category. The average problem solving ability of student math was 8.38 with high ability category. The ...

The purpose of this research are: (1) To know the improvement of problem solving ability of stude... more The purpose of this research are: (1) To know the improvement of problem solving ability of students, (2) To know the improvement of problem solving ability of mathematics students by applying Problem Based Learning Model on geometry topic. The approach of this research is a classroom action research. Subjects in this study were students of class X-6 of SMA (Tenth Year Senior High School) Negeri 1 Pagaran totaling 30 students. The result of data analysis after giving of action in cycle 1, it was obtained 70% classical completeness; m edium problem solving ability category. In the second cycle obtained 90% classical completeness. The category of problem solving ability is very high . Based on the results of data analysis, it can be concluded that the problem-based learning model can improve mathematics problem solving ability.

International Electronic Journal of Mathematics Education, Nov 28, 2018

Qualified learning materials is needed in the efforts to improve the quality of teaching-learning... more Qualified learning materials is needed in the efforts to improve the quality of teaching-learning mathematics. Qualified learning materials can be obtained through development research. Learning materials in this study were learning materials that were developed based on guided discovery learning model. The learning materials was also developed by integrating local culture into a guided learning model. The local culture in this study was adapted to the local culture of the students, namely the Batak Toba. Learning materials in this study were developed using the development model of Thiagarajan et al. (1974). The result of second trial showed that learning materials based guided discovery learning with Batak Toba context improved students' mathematical problem solving ability and self-efficacy significantly. Based on the results of the study, it was suggested that mathematics teachers make an effort qualified learning materials and integrate local culture in mathematics learning.

Paradikma: Jurnal Pendidikan Matematika

Combinatorics is a branch of mathematics that is very important, but this topic has not received ... more Combinatorics is a branch of mathematics that is very important, but this topic has not received serious attention in educational research compared to other branches of mathematics such as geometry, calculus and algebra in Indonesia. Meanwhile, in secondary and undergraduate education, existing research reports that students’ combinatorial thinking ability tend to be low. Efforts to improve students’ combinatorial thinking ability in one of the Vocational Schools in Medan, Indonesia, are carried out through the development of the Numbered Heads Together (NHT). NHT is one cooperative learning structure. The result showed that NHT learning improved students’ combinatorial thinking ability.