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“卫星运行时间(两、三位数乘法)”是北师大版四上第三单元第一课时的内容,属于“数与代数”领域“数的运算”范畴。关于本课学习内容,学生已经具有初步的估算意识,掌握了一些简单的估算方法,具备了“理解并掌握三位数乘一位数的计算方法和两位数乘两位数的笔算方法”的知识基础,积累了通过知识的正迁移在合作探究中探索新知识的活动经验。基于以上情况,笔者确定本节课的学习目标:①能合理估算两、三位数乘法的积的范围,在交流过程中感受估算的价值。②经历探索三位数乘两位数的计算方法的过程,能正确计算,并体验解决问题策略的多样
“Satellite running time (two and three digits multiplication) ” is the content of the first lesson of the third unit of the fourth edition of Beijing Normal University, belonging to the category of “number and algebra ” field “number of operations ”. With regard to the content of this course, students already have a preliminary assessment of awareness, mastered some simple estimation methods, with “understand and master the calculation method of three-digit by one-digit and two-digit by two-digit calculation method ”Knowledge base, accumulated through the positive transfer of knowledge in the exploration of cooperation in exploring new knowledge activities experience. Based on the above, I determine the learning objectives of this lesson: ① can reasonably estimate the range of multiplication of two and three digits, in the exchange process to feel the estimated value. ② experiencing the process of calculating the three-digit by two-digit computing method can be correctly calculated and experience the diversity of strategies to solve the problem