This study aims to develop a problem-based learning model based on metacognitive that is oriented towards improving students' critical thinking skills. This research is a Research Development. The research procedure used for research and development by Borg Gall. The development steps include: Research and Information Collection, Planning, Develop Preliminary of Product, validation by experts, Preliminary Testing, and Main Field Test. However, this research is limited to the step of validation by experts. The subjects of this research were 1 teacher and 2 lecturers. This research instrument are validation sheet for experts and a validation sheet for practitioners. The results of this research are (1) the design of a problem-based learning model based on metacognitive that is oriented towards improving critical thinking skills; (2) learning tools in the form of: Learning Implementation Plans and Student Worksheets in the topic “the three dimensional (3D) shape with flat surface ” of class VIII SMP even semester. The results of the expert and practitioner's validation analysis met the valid criteria. The model development design assessment score is 80%, Learning Implementation Plan score is 88%, and the Student Worksheet score is 88%. Overall, the product developed is suitable for use. Based on the assessment by experts, theoretically, product development can be used to improve students' critical thinking skills.

The purpose of this study was to analyze the effectiveness of the discovery learning-based mathematics learning module in terms of students' interest in learning mathematics. This type of research is quasi-experimental. The research design used was the One Group Pretest-Posttest Design. The research was conducted in class V SDN Ngijo 02 Gunungpati District, Semarang City. The number of students in the class is 28 students. The instrument used in the study was a questionnaire of interest in learning mathematics. Data analysis techniques used parametric statistical tests t-test and N-Gain. The statistical test results showed that the significance value was 0.00, meaning that the average score of students' learning interest after using the discovery learning model-based mathematics learning module was higher than the average score of students' learning interest before using the discovery learning model-based mathematics learning module. The average interest in learning mathematics in class V at SDN Ngijo 02 experienced an n-gain increase of 0.45 with the "medium" criterion. Thus, it can be concluded that the use of discovery learning model-based mathematics learning modules in learning has proven to be effective in increasing interest in learning mathematics for fifth-grade students at SDN Ngijo 02. Keywords: learning modules, mathematics, discovery learning, interest in learning

Penelitian ini dilakukan untuk mengetahui analisis kemampuan pemecahan masalah matematis siswa kelas V SD di Kecamatan Gunungpati Kota Semarang. Peneliti menggunakan jenis penelitian kualitatif deskriptif. Subjek penelitian yang digunakan adalah siswa kelas V dan  Guru kelas V Sekolah Dasar SD Negeri Ngijo 02. Tes dan wawancara digunakan untuk mengumpulkan data pada penelitian ini. Berdasarkan penelitian yang telah dilakukan, diperoleh hasil nilai rata-rata kemampuan pemecahan masalah matematis siswa kelas V adalah 54,76 dengan kriteria rendah. Masih ada kesalahan-kesalahan siswa dalam menyelesaikan masalah pada indikator-indikator tertentu. Kendala yang sering dialami siswa dalam memecahkan masalah adalah kurangnya pemahaman siswa terhadap masalah yang harus dipecahkan dan kurangnya kemampuan siswa dalam menuliskan informasi pada soal.