Based on research, most students have difficulty understanding the principles and operations of numbers. Therefore, the writer was moved to do this research. This research is classified as a qualitative descriptive research that aims to describe students' difficulties when working on problems in the Numbers material. The research subjects were 15 students of class VII B SMP Pasundan 1 Cimahi. The data processing technique in this study uses the formula proposed by Arikunto. From the results of the analysis, the first indicator 73% is classified as sufficient category. The second indicator, namely 55%, is in the poor category. The third indicator reached 73% in the sufficient category. The 4th indicator reached 82% in the good category. The 5th indicator reached 89% in the very good category. From the description above, it is clear that students have the most difficulty in working on number problems, namely that students are still difficult in working on questions with complicated operations. The factors behind these difficulties are: (1) Lack of understanding of the concept of work on number operations, (2) Teacher discussion that is not clear, (3) Insufficient use of learning media.
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