This research aims to find out the influence used Problem Based Learning model assisted by Question Card toward students mathematic critical thinking skill in junior high school. This research was quantitative by using Quasi Experimental with the nonequivalent posttest-only control group design. The technique was purposive sampling method. The instrument of this method was six items, then validity test, reliability test, level of difficulty, and discrimination power. Normality and homogeneity test were used as requirement test and got the data was normal distribution and the two-group homogenous. The hypothesis test used t-test got the result 2,970 made Ho rejected with 5% significance level with effect size was 0,656 or 66% that moderate classified. Based on the result of this research, it can be concluded that there is an influence of problem-based learning model assisted by question card toward mathematic critical thinking skill with moderate criteria.

ABSTRAKPenelitian ini dilatarbelakangi oleh pentingnya dan rendahnya kemampuan penalaran siswa. Penelitian ini bertujuan untuk menelaah peningkatan kemampuan penalaran siswa. Penelitian ini merupakan penelitian kuasi eksperimen dengan desain nonequivalent control group design. Populasi pada penelitian ini adalah seluruh kelas VIII pada salah satu SMP Negeri di Jakarta Barat. Sampel terdiri dari dua kelas yaitu kelas VIII-D dan VIII-F yang dipilih secara purposive sampling. Instrumen yang digunakan berupa tes kemampuan penalaran. Analisis data menggunakan uji-t (Independent Sample T-Test) dan Mann Whitney. Berdasarkan analisis data, ditemukan bahwa Peningkatan kemampuan penalaran siswa yang memperoleh pembelajaran discovery dengan pendekatan saintifik lebih baik daripada siswa yang memperoleh pembelajaran biasa.

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Penelitian ini bertujuan untuk mendeskripsikan faktor penyebab kesalahan yang dilakukan siswa yang mempunyai kemampuan penalaran tinggi dan rendah dalam menyelesaikan soal HOTS berdasarkan teori Newman. Jenis penelitian ini adalah deskriptif kualitatif. Subjek penelitian berjumlah 36 siswa kelas VIII di salah satu SMP Jakarta semester ganjil tahun ajaran 2019/2020 untuk menentukan kategori kemampuan penalaran matematis. Teknik pengumpulan data menggunakan tes dan wawancara. Kerangka analisis dikembangkan berdasarkan kategori kesalahan Newman. Hasil penelitian menunjukkan siswa kemampuan penalaran tinggi matematis (SKPT) memiliki kesalahan dalam memahami soal dan kesalahan keterampilan proses serta mampu menyelesaikan soal HOTS dengan benar tanpa ada kesalahan, sedangkan siswa kemampuan penalaran rendah (SKPR) rendah memiliki kesalahan memahami soal HOTS dan kesalahan dalam keterampilan proses. Faktor yang menyebabkan kesalahan SKPT adalah kekeliruan dalam melakukan perhitungan dalam menyelesaikan soal HOTS sedangkan, faktor penyebab kesalahan SKPR adalah pada segi kognitif yaitu kurang memahami soal dengan baik.

This research is a preliminary study that aims to describe the algebraic thinking process of prospective mathematics teachers. This research is a qualitative descriptive study. Subjects were grouped into two categories based on high and low achievement motivation. Data is obtained based on the results of tests conducted in the algebra process. Research subjects (S1) and (S2) with high achievement motivation and subjects (S3) and (S4) with low achievement motivation using different algebraic thought processes. Subjects (S1) are able in the process of thinking algebra until crashing indicators assess understanding with understanding of the concept wrong in solving Higher Order Thinking Skills (HOTS) problems, whereas, (S2) the process of thinking algebra is only capable of chunking information (pieces of information), (S3) able in the process of thinking algebra until indicators of change with wrong answers, and the subject (S4) is able in the process of thinking algebra only until chunking information (pieces of information). Factors that cause subjects S1, S2, S3, and S4 are still unable to solve HOTS questions in algebraic thinking processes are questions of knowledge on HOTS material and difficulty understanding concepts in working on algebra need special handling in improving understanding of concepts in algebra.