人教版一下数学两位数减一位数获奖公开课课件.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,两位数减一位数,(,退位减法,),哈尔滨市花园小学,王 莹,57,4,57,40,75,3,75,30,53,17,72,45,36,8,还剩多少个足球？,12,5,7,20,7,27,27,14,9,5,30,5,35,35,先圈一圈，再计算。,7,6,4,5,7,3,6,4,3,7,6,8,5,7,9,6,4,8,7,2,5,4,6,1,6,8,4,8,5,6,不退位减法,退位减法,73,3,2,5,4,8,9,1,6,0,1,2,3,6,46,8,34,5,54,8,54,3,7,4,5,6,7,8,9,3,2,1,0,9,8,7,6,5,4,