教材简析,发现问题教材是教师施教、学生学习的主要资料。它为师生有效展开学习活动提供了可借鉴的蓝本。如果教师一味依照教材展开教学活动,可能会陷入简化、僵化、虚化的伪学习活动中,盲目地照本宣科呈现现成的结论或规律,而缺失了学生在学习历程巾体验知识形成过程的活动经验累积,无法深入彰显固定知识背后丰富的数学思想方法。笔者结合苏教版四上“角的分类和画角”一课谈谈自己的实践体会与思考。【教材剖析与思考】“角的分类和画角”一课是在学生初步学会量角 Analysis of textbooks, textbooks found that problems are teaching, student learning the main data. It provides a blueprint for teachers and students to learn effectively. If teachers blindly follow the teaching materials to start teaching activities, they may fall into simplistic, inflexible and fake pseudo-learning activities. They blindly follow the existing conclusions or laws, and they lack the accumulated experience of students in learning process experience knowledge formation process , Can not thoroughly demonstrate the rich mathematical thinking behind fixed knowledge. The author combines the Sujiao version of the four “angle of the classification and angle painting ” a lesson to talk about their own practice experience and thinking. [Textbook analysis and thinking] “corner classification and painting angle ” a lesson is the initial learning of students