<![CDATA[Abstract: The aimed of this research is to describe the mistakes of the students grade VI in elemetary school that is related to addition and subtraction fraction operation and the causal factors. This research used explanatory design. the data is in the form of test. The result of this research indicated that 61% students do mistakes in addition fraction operation and 63,3% students do mistakes in subtraction fraction operation. The mistakes consist of misprochedure, misconception, misinterpretation of the directions, careless, wrong implementation, and unstudied. According to those datum, the result of discussion can be summed up that the mistakes of the students in addition fraction operation reach 61% and subtraction fraction operation reach 63,3%.Keyword: students’ mistakes, addition, subtraction, fractions.Abstrak: Tujuan penelitian ini adalah mendeskripsikan kesalahan siswa kelas VI SD terkait dengan operasi penjumlahan dan pengurangan pecahan serta faktor penyebabnya. Penelitian ini menggunakan rancangan explanatory design. Data berupa hasil tes. Hasil penelitian ini, ditemukan bahwa 61% siswa mengalami kesalahan pada operasi penjumlahan pecahan dan 63,3% siswa pada operasi pengurangan pecahan. Kesalahan siswa meliputi kesalahan prosedur, kesalahan konsep, kesalahan dalam menyalahartikan petunjuk, kesalahan karena kecerobohan, kesalahan aplikasi, dan kesalahan belajar. Berdasarkan paparan data hasil pembahasan, dapat disimpulkan bahwa kesalahan siswa pada operasi penjumlahan pecahan mencapai 61% dan pada operasi pengurangan pecahan mencapai 63,3%.Kata kunci: kesalahan siswa, penjumlahan, pengurangan, pecahan.]]>
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