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Mathematical cognitive ability, is an ability that supports students' skills in learning mathematics. One of the cognitive abilities developed is the mathematical conjecturing ability in junior high school students. Conjecture is the reason why someone has a belief, an explanation of why a belief is true, or how someone knows what they know. Therefore, it is necessary to conduct an in-depth study and analysis of students' mathematical conjecturing ability. This study involved 26 students in one of the junior high schools in Serang City as research subjects, the approach used in this study was a qualitative approach. The results of this study was that students’ mathematical conjecturing ability was still classified as not good in the category of students' ability in making evidence of solutions. Therefore, an improvement was given from the lack of ability of students' mathematical conjecture.

Mathematical Conjecturing Ability in Junior High School Students on the Material of Angles, Lines, and Two Dimensional Figure