第6课时 跳绳(1),把不对的改正过来。优翼,367,31,648,29,16,2,3,1,9,2,14,5,6,6,5,66,56,4028,10,3,2,1,答:小红比小亮多跳12下。,3228,322012,1284,3228,12,2,4,0,答:小亮比小东少跳4下。,212,536,19,47,7034,36,11,1,9,1,13,4,7,4,10,6,6,3,两位数减两位数退位减法: 相同数位对齐,从个位减起,个位不够减,就在十位借1当十。,212,536,19,47,7034,36,8558,27,4427,17,15,7,7,2,1、用小棒或计数器做一做,再用竖式算一算。优翼,14,3,7,1,8055,25,6419,45,10,7,5,2,1、用小棒或计数器做一做,再用竖式算一算。优翼,14,5,5,4,2、买1个羽毛球拍多少元?优翼,5029,10,4,1,2,答:买1个羽毛球拍21元。