二年级数学下册第4章表内除法(二)整理与复习课件新人教版.ppt

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1、1.每个小组都有一些我们学过的除法算式卡片,你们能快速地算出这些算式的得数吗?,活动要求: 1. 同桌两人一组,把手中的算式卡片摆一摆。(一人摆卡片,一人负责记录。) 2. 全班交流:你是怎么整理的?,2.你能根据这些算式的特点进行整理吗?,问题: 1.从乐乐整理的表中你能发现什么?,让我们一起来看一看乐乐是怎么整理的。,同学们真会认真观察,能在这个表中发现这么多规律,并且按照规律把所有的算式都填写出来了,你们真了不起!,123,153,183,213,243,273,124,164,204,244,284,324,364,105,155,205,255,305,355,405,455,66,

2、126,186,246,306,366,426,486,546,77,88,99,147,217,287,357,427,497,567,637,168,248,328,408,488,568,648,728,189,279,369,459,549,639,729,819,2.根据你的发现把余下的算式填出来。,1. 根据算式说得数。,利用网络,理解沟通,549,455,728,273,9,6,9,9,(1)你能快速算出这些算式的得数吗?,(2)你们怎么算得这么快呀?,(1)在乐乐整理的这个表格中快速找出得数为7的算式。,(2)还有补充的吗?,(3)谁能说说你是怎么找到这些算式的?,(4)得数是

3、8的算式有哪些?得数是9的呢?,(5)你是怎么找的?,2. 根据得数找算式。,利用网络,理解沟通,原来得数是几,我们就得找跟几的口诀有关系的除法算式。,(1)你能很快算出它们的得数吗?,(2)谁来汇报一下你的计算结果?,我们在口算的时候,一定要认真仔细,看清运算符号,这样才能算得对。,8,56,5,7,5,21,6,60,7,648,459,306,37,546,568,729,284,59,427,273,328,45,9,4,1. 看谁算得都对。,(3)都有哪些同学算对了?,(1)你能帮助每只小鸟找到自己的家吗?赶快动手连一连。,(2)谁来汇报一下你的结果?,小鸟非常感谢大家帮助它们找到了自己的家。,2. 小鸟回家。,这节课我学会了什么?快来说一说吧!,课本第46页练习十第2,3,4题。,xx小学 x年级x班,xxx,

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