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三位数乘两位数复习教师：秦仕祥 总第 课时
| 课题 | 三位数乘两位数复习 | 课时 | | 授课时间 | | |||||
| 教学 目标 | 通过复习帮助学生进一步理解和掌握三位数乘两位数的计算道理和计算方法，并能正确、熟练地进行计算，提高学生的计算能力，培养学生认真书写、细心计算的学习习惯。 | |||||||||
| 重点 难点 | 计算方法 | |||||||||
| 教具 学具 | | 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 口算：第7页的第1题 二、整理复习 1、本单元我们学习了那些知识？ 2、你掌握了什么知识？（以247×46为例说算理、计算方法） 3、计算练习 ⑴ 第7页的第2 题 学生计算后评讲。 ⑵ 第8页的第6题 学生计算后研究：你发现什么？为什么每组的两题得数一样？ ⑶ 第8页的第7题 你是怎么简便计算的？为什么这样计算？ 4、数学文化介绍 古代中国人用铺地锦方法计算，并研究其计算道理：与竖式计算的道理差不多。 | 学生集体口答得数。 先让学生独立思考，再全班交流。 学生练习。 学生计算。 学生思考得出：实际上应用了乘法结合律。 学生用简便方法计算。学生思考寻找原因：运用了乘法交换律和结合律。 让学生观察和思考：这样计算的道理我什么？ | | ||||||||
| 教 后 记 | | |||||||||
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