12整十数加、减整十数

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,*,*,整十数加、减整十数,40,座,30,座,70,40,30 =,(,个,),4,个十加,3,个十得,7,个十，是,70,。,4,3 =,7,40,30 =,70,40,70,30 =,你是怎样想的？,1,.,50,40 =,90,40 =,=,=,90,40,50,90,50,90,40,50,3,2 =,5,30,20 =,50,2,.,5,1 =,4,50,10 =,40,2,3,4 =,9,20,30,40 =,90,9,3,2 =,8,90,30,20 =,80,3,.,10,60,30,70,60,40,50,80,10,70,30,3,.,40,80,20,50,30,6,40,60,10,40,46,4,.,60,30 =,90,90,70 =,20,20,40 =,60,60,20 =,40,30,30 =,60,70,10 =,60,80,50,7 =,37,10,80,6 =,96,30,70,40 =,60,5,.,我拔的和你同样多。,一共拔了多少个？,=,20,20,40,（个）,