Teacher questioning techniques are key to developing student critical thinking skills. However, research has been proven that 93% of teacher questions are based on recall. Evidently, recall and knowledge based questions are not the type of questions that will encourage analytical and evaluative thinking. An effective way for teachers to improve questioning techniques is to know and use critical thinking question stems or prepare critical thinking questions prior to conducting discussions or guided activities. This teacher resource provides a starting point in developing a teacher’s capacity to create effective questioning techniques. This resource book provides over 120 critical thinking questions that are categorized into Math, Science, Social Studies, and Reading questions. If needed, a teacher can modify the questions according to the day’s lesson or activities. I hope that you find this teacher resource helpful in developing your students’ critical thinking skills.