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三位数乘两位数（1）教师：秦仕祥 总第 课时
| 课题 | 三位数乘两位数 | 课时 | 1 | 授课时间 | 2012、2、7 | |||||||||
| 教学 目标 | 1、使学生应用两位数乘两位数的计算原理，自主探究出三位数乘两位数的计算道理，并能归纳出三未数乘两位数的计算法则。 2、使学生掌握三位数乘两位数的计算方法，并能正确、熟练地进行竖式计算。 3、让学生在探究三位数乘两位数的过程中，磨砺学生的思维，发展学生的迁移能力、思维能力。 | |||||||||||||
| 重点 难点 | 三位数乘两位数的算理及计算方法。 | |||||||||||||
| 教具 学具 | 多媒体课件 | 板书 设计 | | |||||||||||
| 预习 要求 | | |||||||||||||
| 教师活动内容、方式 | 学生活动内容、方式 | 备 注 | ||||||||||||
| 一、训练、复习 1、口算（略） 2、出示铺垫题 ⑴问：这是什么地方？（告诉学生是一个住宅小区） 你想知道这个小区有多大吗？好！现在秦老师给你一些信息，自己解决这个问题吧！ 出示：月星小区有15幢楼，平均每幢楼住44户，这个小区有多少户？ ⑵怎么列式？ ⑶怎么计算44×15？ ⑷怎样计算最方便？你会用竖式计算吗？ 3、把“每幢住44户”改成“每幢住144户” ⑴怎么列式？ ⑵这道算式与以前学习的乘法算式有什么区别？ 二、导入新课 今天我们就来研究三位数乘两位数的计算。 三、进行新课： 1、研究144×15的算理 ⑴根据以前学习的两位数乘两位数的计算，思考一下：你打算怎么计算144×15？ ⑵这是计算的道理，但是在计算时还可以怎样算？你会用竖式计算吗？ 1 4 4 × 1 5 7 2 0 1 4 4 2 1 6 0 这一步算的是什么？0为什么写在个位上？ 这一步算的是什么？4为什么写在个位上？ ⑷ 与44×15比较，计算时有什么相同的地方？ 有什么不同的地方？ ⑸你们会计算吗？ 2、练习 ⑴第1页：想想做做 1 ⑵第1页：想想做做 2 ⑶第2页：3、 4 四、师生总结 今天我们学习了什么知识？怎样计算三位数乘两位数？ | 学生列式44×15。 学生思考回答：44×5＝220， 44×10＝440， 440＋220＝660 4 4 × 1 5 2 2 0 4 4 6 6 0 让学生列式144×15。 学生思考回答。 学生思考得出：144×1＝1440 144×5＝720， 1440＋720＝2160 学生尝试计算 学生思考并回答？ 学生思考回答：相同点：都是分三步计算（两步乘一步加）；不同点：44×15每次只乘两次。144×15每次要乘三次。 学生计算后评讲。 学生先找错误点，再订正，最后评讲。 | | ||||||||||||
| 教 后 记 | | |||||||||||||
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