The Level of Critical Thinking Ability of Students in Solving the Question of Sequence and Series

Abstract

The purpose of this research is to describe students’ critical thinking ability in solving arithmetic sequence and series questions at Public Senior High School 5 of Jember. The subjects of this research were 29 students of X MIPA 4. They were categorized into 3 groups, comprising of high, medium, and low ability based on their Mathematic scores in the first semester. Documentation, test, and interview were used as data collection method. Based on the result of the critical thinking ability test and the interview, two subjects chosen from low-ability group were categorized as level 0 of critical thinking ability (not critical), henceforth (CTA). Three subjects were chosen from medium ability students, one subject was categorized as level 1 CTA (less critical), and two subjects were categorized level 2 CTA (fairly critical). One subject chosen from high ability students was categorized as level 3 CTA (critical). From the result of the research, the subject was only able to reach critical level (level-3 CTA) and 5 of the other subjects were still in the low critical thinking levels, reaching level 0, 1, and 2 of CTA