Identification of Student’ Critical Thinking Ability in Solving Open Ended Mathematics Problem Viewed From Cognitive Styles

The research purpose is to identify student’ critical thinking ability in problem solving based on their cognitive styles. The research subjects are two student who have reflective or impulsive cognitive style. The data were collected by giving cognitive style, mathematics ability, and problem solving tests, and interview. The research result showed that the reflective student has seven indicators of critical thinking ability; they are the ability to comprehend and express the meaning of information, distinguish relevant and irrelevant information, analyze the data, collect and organize information, find ways of completion, draw conclusions, and evaluate the completion. Based on the level of critical thinking, she is very critical. While impulsive student has four of the seven indicators of critical thinking ability, they are the ability to comprehend and express the meaning of information, distinguish relevant and irrelevant information, collect and organize information, and draw conclusions.