育新小学三年级上《运白菜》.ppt

*,Click to edit Master text styles,Second level,Third level,Fourth level,Fifth level,*,*,Click to edit Master text styles,Second level,Third level,Fourth level,Fifth level,*,*,*,Click to edit Master text styles,Second level,Third level,Fourth level,Fifth level,*,*,*,Click to edit Master text styles,Second level,Third level,Fourth level,Fifth level,*,*,*,*,*,*,单击此处编辑母版标题样式,单击此处编辑母版文本样式,第二级,第三级,第四级,第五级,*,*,*,北师大三年级数学上册,运白菜,(,三位数连减,）,1,忆一忆,（用竖式计算并验算）,7 1 6,-9 8,4 3 2,-1 5 8,1,4,2,8,6,6,1,7,7,2,3,4,1,1,验算,1,1,验算,6 1 8,+9 8,2 7 4,+1 5 8,2,看一看,3,看一看,运走,256,棵,运走,280,棵,共,850,棵白菜,4,说一说,1,、你能提出什么数学问题？,2,、我想知道运走两车后还剩多少棵白菜，怎 么计算？,5,算一算,850-256-280,=,=,8 5 0,-2 5 6,5 9 4,-2 8,0,第一车运走以后，还剩,4,9,5,594-280,4,1,3,314,棵,6,算一算,850-,（,256+280,）,=,=,2 5 6,+2 8,0,8 5 0,-5,3 6,两车一共运走,6,3,5,850-536,4,1,3,314,棵,1,7,试一试,1000-207-168=436-179-36=,3,9,7,7 9 3,-1 6 8,5,2,6,625,1 0 0 0,-2 0 7,4 3 6,-1 7 9,7,5,2,2 5 7,-3 6,1,2,2,221,8,试一试,900,281,436,=900,717,=,283,900,281,436,=719,436,=,283,（用两种方法计算）,900,(281+436,）,9,试一试,1000,185,145,=1000,330,=670,1000,185,145,=815,145,=670,（用两种方法计算）,1000,(185+145),10,休息一下,11,练一练,1,200,78,35,122,35,87,（元）,78,元,52,元,35,元,75,元,12,练一练,1,（,2,）请你再提出一个数学问题，并试着解答。,78,元,52,元,35,元,75,元,13,练一练,2.,森林医生。,216,109,182,07,1,4,5,1,805,273,32,6,632,416,4,2,2,5,532,6,1,1,14,练一练,3.,15,谈一谈,谈谈今天你学到了什么？,这节课你在哪里容易出错？,16,再见,