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This research aimed to analyze students’ misconception using certainty of response index (CRI) in solving number pattern problems. It was aimed to identify weather students have misconceptions or not and to differ it cleary with students that do not and do know the concept. This research was descriptive qualitative research. Subject in this research involved 14 students of SMPN Loro Tuan and students misconception as the research object. The research data were obtained through mathematics tes which was accompined by CRI quisionere and interviews. Data analysis was carried out descriptively to reveal and describe students who have misconceptions both classically and individually on each indicator of the questions tested. Then subjects who have misconception were inreview based on their answer of the test. The results of this research indicated that there were students misconceptions on each indicator of the questions tested. Individually there were 78.57% of students experiencing misconceptions at least on one indicator of the questions being tested, with details of 36% on the question number 1, 29% on the question number 2, 43% on the question number 3, and 50% for the question number 4. It was also found that classically students have misconception in solving the number pattern question. It was indicated by the high percentage of students who answer wrong with high average of CRI in each number of question. The results of this research also found that the misconceptions experienced by students were based on several things, including (1) pre-conception, (2) errors in understanding the meaning of words, (3) simplification, and (4) stress on practical aspects.

ANALISIS MISKONSEPSI SISWA KELAS VIII SMPN LORO TUAN PADA MATERI POLA BILANGAN DENGAN CERTANTY OF RESPONSE INDEX(CRI)