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1、复习旧知识,你是怎样算出15-9=?这个算式的得数的呢?,15-9=,16-9=,想:因为9+ 7=16 所以 16-9= 7,想加算减,16 - 9=,6,1,10,破十法,7,11 9 =,12 9 =,13 9 =,14 9 =,15 9 =,16 9 =,17 9 =,18 9 =,你发现了什么?,2,3,4,5,6,7,8,9,十几减9,是几加1,开火车啦!,8+( )=13 8+( )=128+( )=14 8+( )=118+( )=17 8+( )=158+( )=18 8+( )=16,5,6,9,10,4,3,7,8,12-8=,4,还剩几个?,想:,10-8=2,2+2=
2、4,破十法,12-8=,还剩几个?,8+( )=12,4,12 - 8 = 4,想加法算减法,想:,4,13枝,?枝,138=,15个,?个,158=,7+( )=13 7+( )=127+( )=14 7+( )=117+( )=15 7+( )=166+( )=11 6+( )=136+( )=15 6+( )=12,13-7=,13-6=,13-7=,想:,10-7=33+3=6,想:7+( )=13,13-7=6,6,13 6 =,想:,10-6=43+4=7,7,想:6+( )=13,13-6=7,7,6,8,6,8,8,8,7,7,11 9 =,12 9 =,13 9 =,14 9
3、 =,15 9 =,16 9 =,17 9 =,18 9 =,你发现了什么?,2,3,4,5,6,7,8,9,十几减9,是几加1,11 8 =,12 8 =,13 8 =,14 8 =,15 8 =,16 8 =,17 8 =,你发现了什么?,3,4,5,6,7,8,9,十几减8,是几加2,11 7 =,12 7 =,13 7 =,14 7 =,15 7 =,16 7 =,你发现了什么?,4,5,6,7,8,9,十几减7,是几加3,11 6 =,12 6 =,13 6 =,14 6 =,15 6 =,你发现了什么?,5,6,7,8,9,十几减6,是几加4,请大家谈谈今天的收获,今天我学习了( ),其中最喜欢的方法是( ),十几减8、7、6,