This study aims to determine the effect of the Problem Based Learning model on students' mathematical problem solving abilities. In addition, this study also looked at the interaction between learning and gender on students' mathematical problem solving abilities. This research was a quasi-experimental study. The population in this study consisted of all students in junior high school (SMP) 7 Padangsidimpuan totaling 423 students. The study sample consisted of 46 students, namely 23 students in grade VIII-3 and 23 students in grade VIII-6. Data analysis was performed with two-way ANOVA using SPSS version 21.0. The results of this study indicate that there is the effect of the Problem-Based Learning model on mathematical problem solving ability of students. In addition the result also show that there is no interaction between learning and gender on students' mathematical problem solving abilities.
ABSTRAK Penelitian ini bertujuan untuk mengetahui apakah kemampuan pemecahan masalah matematis siswa yang diajarkan dengan model pembelajaran kooperatif tipe STAD lebih tinggi daripada siswa yang di ajarkan dengan model pembelajaran langsung pada siswa kelas VIII SMP Muhammadiyah 3 Medan. Populasi dalam penelitian ini adalah seluruh siswa kelas VIII SMP Muhammadiyah 3 Medan dan sampel dalam penelitian ini adalah siswa kelas VIII-A dan kelas VIII-B sebanyak 72 siswa. Kelas VIII-A diberi STAD dan kelas VIII-B diberi pembelajaran langsung. Jenis penelitian ini adalah eksperimen semu. Dari analisis data pada kelas eksperimen diperoleh nilai rata-rata pre test 58,18 dan simpangan baku pre test 7,62 sedangkan nilai rata-rata post test 86,70. Pada kelas kontrol diperoleh nilai rata-rata pre test 58,14 dan simpangan baku pre test 8,70 sedangkan nilai rata-rata post test 78,28. Dari analisis data postest dengan menggunakan uji-t pada taraf = 0,05 diperoleh thitung = 2,12 dan ttabel = 1,668 yang ternyata thitung > ttabel maka H0 ditolak dan Ha diterima. Maka dapat disimpulkan bahwa kemampuan pemecahan masalah matematis siswa yang diajar dengan menerapkan model pembelajaran STAD lebih tinggi daripada siswa yang diajar dengan pembelajaran langsung pada materi kubus dan balok. Kata kunci: Kemampuan Pemecahan Masalah Matematika, STAD, Pembelajara Langsung ABSTRACTThe aim of this research were to know whether the problem solving skills of mathematics students who was taught by using cooperative learning model STAD type is higher than students who was taught by using direct instruction in class VIII SMP Muhammadiyah 3 Medan. The population in this research was all of the students in class VIII SMP Muhammadiyah 3 Medan and the sampel are the students in class VIII-A and VIII-B which total 72 students. Class VIII-A was taught by using STAD and class VIII-B was taught by using direct intrustion. This is quasi experiment. The result of this research the mean of pretest of the data in experiment class was 58,18 and standard devision of pretest 7,62 although the mean of posttest 86,70. The result of this research the mean of pretetst of the data in control class was 58,14 and standard devision of pretetst 8,70 although the mean of the data posttest 78,28. From the analysis data of posttest with using t-test with = 0,05, the result thitung = 2,12 and ttabel = 1,668 and evidently thitung > ttabel so H0 was rejected dan Ha was accepted. So the conclusion is problem solving skills of mathematics students who was taught by using cooperative learning model STAD type is higher than students who was taught by using direct instruction. Keywords : Mathematics Problem Solving Ability, STAD, Direct Instruction
Critical thinking is a part of higher order thinking ability that require students to develop the process of analyzing or evaluating information on a problem based on logical thinking to determine decissions. But the fact in learning mathemathics, this ability is still not developed well, so that the aplication of problem based learning is expected to be a solution to increase student's mathematics critical thinking ability. The purpose of this study is to identity the increasing of students' mathematics critical thinking ability as an impact of problem based learning approach. This study was an quasi experimental research. The population of this research is all students in Junior High School of Dwitunggal Tanjung Morawa. The students in VII-1 is choosen as the experimental class and students in VII-2 is choosen as the control class by purposive sampling technique. The data in this study were analyzed using Two Ways ANOVA. The result of this research are the increasing of student's mathematics critical thinking ability using problem based learning is higher than regular learning and there is no interaction between mathematics prerequsite ability and learning on student's mathematics critical thinking ability. Keywords-mathematics critical thinking ability, problem based learning.
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