教学内容人教版《义务教育课程标准实验教科书·数学》四年级上册第三单元例5教学目标1.让学生探究三位数乘两位数的估算方法,实现估算方法的多样化。2.通过引导学生进行估多、估少的训练,培养学生的数感,沟通估算与精算之间的关系,提高学生的计算能力。3.引导学生结合具体情境灵活选择估算方法,培 Teaching content PEP “compulsory education curriculum standard experimental textbook · Mathematics” fourth grade on the third unit Unit 5 teaching objectives 1. Let students explore three-digit by two-digit estimation method to achieve the diversity of estimation methods. 2. By guiding students to assess the amount of training, less training to develop a sense of the number of students to communicate the relationship between estimation and actuarial, improve students’ computing power. 3. Guide students to combine specific situations flexible choice of estimation methods, training