Challenges in teaching critical thinking in the classroom include addressing diverse learning styles and overcoming fixed mindsets among students. Some learners may struggle with the open-ended nature of critical thinking tasks, finding it difficult to express their thoughts coherently. Additionally, teachers might face constraints due to standardized curriculums that prioritize rote learning over inquiry-based approaches. To combat these challenges, educators can incorporate discussion-based activities, real-world problem-solving exercises, and provide feedback that encourages reflective thinking, fostering an environment conducive to developing critical reasoning skills.