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1、第二单元 20以内的退位减法,十 几 减 8,中卫九小 申淑娟,8+6=,8+7=,8+3=,14,15,11,8+8=,16,8+4=,12,8+5=,13,8+2=,10,8+( )=17,9,抢答,17 9 =( ),12 9 =( ),15 9 =( ),11 9 = ( ),13 9 =( ),8,6,3,2,4,18 9 = ( ),9,14 9 =( ),19 9 =( ),5,10,1. 圈一圈,算一算。,绿色圃中小学教育网,8,7,做一做:,8 5=,13 8 =,8 3 =,11 8 =,8 6 =,2、,14 8 =,11 8 =,12 8 =,13 8 =,14 8 =
2、,15 8 =,16 8 =,17 8 =,3、,18 8 =,10 8 =,2,9,4,5,6,7,8,3,10,10 8 = 2 11 8 = 3 12 8 = 4 13 8 = 5 14 8 = 6 15 8 = 7 16 8 = 8 17 8 = 9 18 8 = 10,十几减八就等于十几的个位数加上2。,跳木桩,7,5,9,3,4,15 8 13 8 14 8 17 8 11 8 12 8,6,送信,13-8,14-8,15-8,胜利,18-8,17-8,12-8,11-8,18-7,20-8,( )-8=5,16-8,入口,树上原来有14只小鸟,,飞走了8只小鸟。,原来有1个松果,小松鼠搬走了8 个。,14-8=6(只),15-8=7(个),小结:,同学们这节课你们玩得快乐吗?那你学到了什么呢?和大家分享一下吧!,=,给、或=找个家 。 12-8 3 11-8 11+8 13-3 13-8 16- 8 8,13-( )=5 17-( )=9 15-( )=7 16-( )=8,想一想,填一填。,8,8,8,8,