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This research was conducted to school students to find out misconceptions about the KPK and FPB material. Miskonespsi often occurs in elementary school students, because of the inability of the initial concept with the next concept, in this case concerning operations and arithmetic. This study aims to determine the level of mastery of the concept of multiples, factor concepts, algorithms looking for KPK and FPB, as well as distinguishing prime numbers and non-prime numbers. This research method uses case studies by gathering existing data.
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