“引导—发现”教学模式一般由下列程序操作完成:创设情境、提出问题—大胆猜想、建立假说—合作探究、拟定计划—动手实践、验证假说—总结规律、拓展提高。1.创设情境、提出问题。依据教材内容创设生活情境或问题情境引出数学问题或悬念,激发学生的求知欲望和学习兴趣,进而引发学生的积极思维。如教学《长方形和 The “guide-discovery” teaching mode is generally completed by the following procedures: creating situations and asking questions - making bold conjectures, establishing hypotheses - collaborating on exploration and drawing up plans - hands-on practice and verification of hypothesis - summarizing laws and expanding them. 1. Create a situation, ask questions. According to the content of the text to create a living situation or problem situations lead to mathematical problems or suspense, to stimulate students ’desire for knowledge and interest in learning, and then trigger the students’ positive thinking. Such as teaching "rectangular and