【教学目标】1.通过整理和复习,学生形成一定的知识网络。系统掌握运算定律、性质等。明确各自的特点,能按照题目的具体情况,应用运算定律或性质等选择简便的解答方法。2.进一步掌握混合运算的运算顺序。3.激发学生对学习简算技能、形成简算意识的积极的情感体验,有意培养学生的简算意识,并最终养成简算习惯。【教学重难点】1.重点:能够根据数和运算符号的特点,分辨能否进行简算,并能灵活 Teaching Objectives 1. Through the consolidation and review, students form a certain knowledge network. System master the law of operation, nature and so on. Clear their own characteristics, in accordance with the specific circumstances of the problem, the application of the law of nature or the nature of the choice of easy answers. 2. Further grasp the order of operation of mixed computing. 3. To stimulate students to learn simple skills, the formation of a simple sense of the positive emotional experience, intended to cultivate students’ simple-minded consciousness, and ultimately develop simple habits. Difficulties teaching】 【1. Key: According to the number and operation symbols of the characteristics of the resolution can be simple and flexible