Mathematical problem solving ability is one of the abilities that must be mastered by students in order to be able to mathematically solve problems often found in real life. Indicators of mathematical problem solving capabilities include being able to understand problems, plan problem solving strategies, perform strategies or procedures for problem solving, and check the truth of answers or results obtained. This study aims to determine the mathematical problem solving abilities of junior high school students in terms of Early Mathematical Ability (KAM). The method used in this study is descriptive. The research subjects were class VIII F Space Junior High School Sulaiman Air Base which numbered 30 people. The instrument used in the study was a test of the questions about the mathematical problem solving abilities of 5 questions. Analysis of the data used in this study is to classify students based on the results of the Middle Semester Assessment (PTS) as students' initial abilities. Students are divided into three groups, namely the upper KAM group, the middle KAM group and the lower KAM group. The results showed that students had difficulty working on the number 5 questions and both the upper KAM group students, the middle KAM and the lower KAM students, students did not master the 4th indicator, namely checking the correctness of the answers.
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