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This study was purposed to describe problems used to measure mathematical thinking aspect abstraction in topic number of pattern for junior high school students. Mathematical thinking aspect abstraction has 5 indicators, which are: specialization, observation of pattern, generalization, conjecturing and testing conjecture. The subjects of this study were 3 junior high school students grade 8 and 9. This study was design research which is consisting: Preliminary design, FGD, trial, interview, and retrospective analysis. The data analysis that used in this study was qualitative. As the result, for question in topic number of pattern number 1, student 1 and student 2 showed the appearance of 2 indicators (specialization and observation of pattern), and student 3 showed 4 indicator (specialization, observation of pattern, generalization and conjecturing). For question number 2, student 1 showed 4 indicators (specialization, observation of pattern, generalization and conjecturing), and student 2 showed only 2 indicators (specialization and observation of pattern) and student 3 showed 4 indicator (specialization, observation of pattern, generalization and conjecturing). For question number 3, all of 3 students can answer correctly, all of them also showed specialization indicator, but only student 1 that could show observation of pattern, generalization, conjecturing and testing conjecture indicators