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,苏教,版,数学 一,年级,下册,十几减,9,情境导入,探究新知,课堂小结,课后作业,20,以内的退位减法,课堂练习,1,苏教版 数学 一年级 下册十几减9情境导入探究新知课堂,1,13,9=,(,个),我买,9,个。,还剩多少个?,情境导,入,返回,13 9=(个)我买9个。还剩多少个?情境导入返,2,13,9=,(,个),先减去,3,个,,再减去,6,个。,4,平十法,探究新知,返回,13 9=(个)先减去3个,再减去6个。4平十,3,13,9=,(,个),从,10,个里减去,9,个,4,破十法,返回,13 9=(个)从10个里减去9个4破十法返,4,13,9=,(,个,),9,加,(),得,13,,,13,减,9,得,4,。,4,想加算减,4,返回,13 9=(个)9加()得13,13减9得4。,5,13,9=,(,个,),4,先减去,3,个,,再减去,6,个。,从,10,个里减去,9,个,9,加,(,4,),得,13,,,13,减,9,得,4,。,平十法,破十法,想加算减,你喜欢哪种方法?,返回,13 9=(个)4先减去3个,再减去6个。从,6,12,9=,3,1.,先圈一圈,再计算。,16,9=,7,课堂,练习,返回,12 9=31.先圈一圈,再计算。16 9=7课,7,?个,15,个,?根,17,根,15,9=,6,17,9=,8,2.,返回,?个15 个?根17 根15 9=617 9=8,8,9,2=,11,11,9=,2,9,5=,14,14,9=,5,9,9=,18,18,9=,9,3.,返回,92=11119=295=14149=59,9,12,9=3,4,.,15,9=6,17,9=8,13,9=4,16,9=7,19,9=10,11,9=2,18,9=9,14,9=5,10,9=1,返回,129=3 4.159=6 17,10,11,9,=,2,14,9,=,5,17,9,=,8,12,9,=,3,15,9,=,6,18,9,=,9,13,9,=,4,16,9,=,7,19,9,=,10,5,.,返回,119=2149=5179=8129=315,11,1.,平十减,2.,破十减,3.,想加算减,课堂小结,这节课你们都学会了哪些知识?,返回,1.平十减2.破十减3.想加算减课堂小结这节课你们都学会了哪,12,补充习题:,第,1,页,课后作业,返回,补充习题:课后作业返回,13,谢谢欣赏,谢谢欣赏,14,
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