小学人教四年级数学《口算除法》课件.ppt

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,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,*,*,瓮安县中坪小学 肖波,口算除法,除数是两位数的除法,一、复习导入，揭示课题,给小动物们找家。,4005,3609,18006,2804,24004,8004,300,200,70,80,600,40,二、我爱探究,63=155=328=,6030=15050=32080=,你发现了什么规律？,4,（个）,80,20,想一想：,83,20,80,19,二、探究新知,80,20,4,4,有,80,面彩旗，每班分,20,面，可以分给几个班？,82,4,，,8020,4,。,（）个,20,是,80,，,8020,（）。,4,4,三、知识运用,60,20,90,30,40,20,100,20,62,20,93,30,42,20,103,20,60,3,3,90,3,3,40,2,2,100,5,5,1.,15,5,（,），,150,50,（,）。,（）个,50,是,150,，,15050,（）。,二、探究新知,120,30,4,4,3,3,3,3,3,15050,想一想：,122,30,120,28,三、知识运用,180,30,240,40,420,60,210,30,184,30,240,37,420,62,210,29,180,6,6,40,6,6,60,7,7,30,7,7,2.,三、知识运用,30,2,40,3,80,3,90,5,60,30,120,40,240,80,450,90,2,60,3,120,3,240,5,450,看谁算得又对又快。,3.,三、知识运用,30,180,270,30,80,200,280,40,1,6,9,2,5,7,4.,口算下面各题，看看谁能全对。,三、知识运用,240,30,8,（包）,答：要捆,8,包。,5.,四、布置作业,作业,：,第,72,页练习十二,，第,4,题、第,5,题,、,第,7,题。,