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,*,口算,16,8=,2002=,14,0,2,0=,20040=,142=,28,0,4,0=,3208=,1608=,20020=,2,100,40,7,20,7,10,5,7,16,8=,2002=,14,0,2,0=,20040=,142=,28,0,4,0=,3208=,1608=,20020=,2,100,40,7,20,7,10,5,7,被除数不变,14,2=,7,16,8,=,2,32,0,8,=,40,200,2=,100,14,0,2,0=,7,200,40=,5,28,0,4,0=,7,160,8,=,20,200,20=,10,除数不变,商不变,被除数不变,462,11,=,42,462,66,=,462,77,=,7,6,思考,1,、什么数没变,什么数变了?,2,、商随着谁的变化而变化?怎么变的?,3,、它们的变化有规律吗?,除数不变,1320,11=,13211=12,396,11=,36,120,思考,1,、什么数没变,什么数变了?,2,、被除数、除数和商的变化有什么规律?,商不变,72,8 =9,7200,800=,72000,8000=,9,9,商不变,24,8=3,(24)(8)=3,(24,8,)(8,8,)=3,(24,2,)(8,2,)=3,(24,4,)(8,4,)=3,(24,2,)(8,2,)=3,(24,n,),(8,n,),=3,(24,n,),(8,n,),=3,n0,1,、我会算。,342057=60,76800240=320,5600140=40,3420057=,7680024=,56014=,768002400=,34257=,560001400=,6,40,3200,32,40,600,2、,我会填,根据规定,328=4,,在里填上合适的数,在里填上符号。,(,324,),(,8,),=4,(,32,),(,82,),=4,(,32,),(,815,),=4,(,32,),(,8,),=4,4,2,15,100,100,10000,10000,(1),7,0025,=,(2),4,0,00125,=,3,、我会简算。,运用学过的规律不列竖式进行口算,。,(,700,4,),(,25,4,),=2,800,100,=2,8,(,4000,8,),(,125,8,),=,32000,1000,=,32,