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1、20以内的退位减法,复习：,9+2=8+6=7+4=6+5=5+9=4+7=8+5=7+5=8+3=9+5=7+8=5+7=,11,14,11,11,14,11,13,12,11,14,15,12,9+6=,9+7=,9+3=,15,16,12,9+8=,17,9+4=,13,9+5=,14,9+2=,11,9+（）=12,3,5,摆一摆，算一算。,10-9=1；1+()=()。,9+()=12；12-9=()。,3,你喜欢哪种方法？还可以怎样计算？,3,3,2,3,做一做,128=4（个）,114=7（只）,计算,12-5=11+0=12-3=14+4=10-6=11-5=10-4=13-7
2、=6+9=13-9=11-9=12-0=,7,11,9,18,4,6,6,6,15,4,2,12,跳木桩,=,给、或=找个家。12-9 4 11-9 11+913-3 13-9 18-9 9,139,8,3,7,5,2,4,6,159,149,189,179,129,119,169,139,8,3,7,5,2,4,6,159,149,189,179,129,119,169,139,8,3,7,5,2,4,6,159,149,189,179,129,119,169,8,3,7,5,2,4,6,159,149,189,179,129,119,169,139,8,3,7,5,2,4,6,159,14
3、9,189,179,129,119,169,139,8,3,7,5,2,4,6,159,149,189,179,129,119,169,139,8,3,7,5,2,4,6,159,149,189,179,129,119,169,139,8,3,7,5,2,4,6,159,149,189,179,129,119,169,139,8,3,7,5,2,4,6,159,149,189,179,129,119,169,139,8,3,7,5,2,4,6,159,149,179,129,119,169,139,189,13-9,14-9,15-9,胜利,19-9,17-9,12-9,11-9,18-9,20-9,（）-9=5,16-9,入口,树上原来有14只小鸟，,飞走了9只小鸟。,原来有1个松果，小松鼠搬走了9 个。,14-9=5（只）,15-9=6（个）,11 9=2,12 9=3,13 9=4,14 9=5,15 9=6,16 9=7,17 9=8,18 9=9,11 9=212 9=313 9=414 9=515 9=616 9=717 9=818 9=9,
