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This study aims to determine the procedure and to analyze the quality of the HOTS-type test instrument development for number theory courses, as well as to measure students' critical thinking skills. This type of research is research and development (Research and Development) with a formative research model (Tessemer). The test subjects in this study were students of mathematics education class PMAT A semester 2 of the Tarbiyah and Teacher Training Faculty, UIN Alauddin Makassar with a total of 23 people. Based on the results of this study, it is known that 1) the procedure for developing the Formative Research (Tessemeer) model goes through 4 stages, namely the preliminary stage, the self-evaluation stage, the prototyping stage, and the field test stage. 2) the quality of test development is stated to be valid with CVR (Content Validity Ratio) and CVI (Content Validity Index) values, the average total score is 1 with the very appropriate category, practically based on the results of the student response questionnaire analysis is 85.03% in the very positive response category, the results of the lecturer's response were 90% with a very positive response category. reliable with an average total score of 0.798 in the high category (reliable), the average difficulty level of the total score is 0.48 in the medium category, and the differential power of the average total score is 0.35 in the good category. 3) students' critical thinking skills are 47.67 which is in the sufficient category. Thus, it can be concluded that the HOTS-type test instrument for number theory courses to measure students' critical thinking skills is stated to be of good quality.

Critical thinking; test instrument; HOTS