<![CDATA[Abstract: Didactic design of mathematic understanding competency of block and cube in fourthgrade elementary school student. Purpose of the research was to describe: (1) learning obstacles of mathematic understanding competency, (2) design of didactic learning material based on development of a block and cube material understanding competency, (3) implementation of the design of didactic learning material based on development of a block and cube material understanding competency. The research used didactic design research and analyzed qualitatively. An instrument was writing test. Research procedure: prospective analysis, experiment and restropective analysis. Results of the research were an alternative didactic design which could be used in elementary school mathematic learning.Keyword: didactic design, mathematic understanding, block and cube concept, elementaryAbstrak: Desain Didaktis Kemampuan Pemahaman Matematis Materi Balok dan Kubus Siswa Kelas Iv Sekolah Dasar. Penelitian ini bertujuan mendeskripsikan: (1) learning obstacle kemampuan pemahaman matematis,(2) desain didaktis bahan ajar berbasis pengembangan kemampuan pemahaman matematis materi balok dan kubus,(3) implementasi desain didaktis bahan ajar berbasis pengembangan kemampuan pemahaman matematis siswa materi balok dan kubus. Subjek siswa kelas IV SD dengan lokasi penelitian di SDN 1 Pengadilan. Penelitian ini menggunakan penelitian desain didaktis dan dianalisis kualitatif. Instrumen berupa tes tertulis. Prosedur penelitian: prospective analysis, eksperiment dan retrospective analysis. Hasil penelitian ini adalah suatu desain didaktis alternatif yang dapat digunakan dalam pembelajaran matematika SD.Kata kunci: desain didaktis, pemahaman matematis, konsep balok dan kubus, SD.]]>
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