This study aims to describe the 54critical thinking skills of class X science students of SMAN 2 Pontianak, Panca Bakti High School and SMAN 5 Pontianak in Stoichiometry material. This form of research uses descriptive qualitative research. The research sample was students of class X IPA of SMArN 2 Pontianak, Panca Bakti and SMAN 5 Pontianak, totaling 84 students. Students' criticaae8l thinking skills are measured using written tests in the form of essays, and unstructured interviews. The research instrument was validated using the Gregory test matrix. The results obtained that the critical thinking skills of class X science students of SMAN 2 Pontianak, SMAS Panca Bakti, and SMAN 5 Pontianak are classified as less skilled. This is indicated by the low average percentage of students' critical thinking skills of 2.4836 or 62.09%. This proves only a small proportion of students who have critical thinking skills of students on stoichiometry material.
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