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单击此处编辑母版标题样式,单击此处编辑母版文本样式,第二级,第三级,第四级,第五级,*,小学数学第二册,两位数减两位数,两位数减两位数,(不退位),口,算,我最棒,:,60-20=,90-50=,50-20=,67-5=,34-7=,36-10=,82-40=,69-3=,100-40=,65-9=,78-8=,70-30=,86-30=,58-9=,38-6=,40,40,30,62,27,26,42,66,60,56,70,40,56,49,32,皮皮和汪汪,今天真高兴,!,我这里有,19,个,我这里有,37,个,他们一共摘了多少个椰子?,一共有,56,个椰子,56,-,22=,我有多少个呢?,我,有,22个,50,20,30,,,6,2,4,,,30,4,34,。,34,个,十,56,22,1,个,十,5 6,2 2,3,5,6,2,2,5,6,2,2,要把相同数位对齐,4,相同,数位对齐,从个位减起。,34,56,22,笔算:,回忆加法算式,48-18=,48,-18,(),0,3,30,35-31=,35,-31,(),4,4,想,:,个位上得,(),0,想,:,十位上得,(),0,3.,49,-27,(),2,2,80,-20,(),(),(),(),0,6,56,-36,0,2,79-8,1,7,65,-40,5,2,数学王国,21,42,15,6 3,1,8 8,4,5 7,4 2,5,1,2,2,84-63=,8 4,-,(),(,),(,),-4 6,(,),88-46=,(,),-,(,),(),57-42=,88,68,35,37-2,3 7,-2,1 7,65-23,6 5,-2 3,8 8,59-26,5 9,-2 6,3 3,47-21,4 7,-2 1,6 8,3 7,-2,3 5,6 5,-2 3,4 2,4 7,-2 1,2 6,33,火眼金睛判对错,17,42,26,4 5,-3 2,1 3,4 7,-4 2,5,7 6,-2 4,5 2,猜一猜,32-11=,21,(个),实践应用,答:还剩()个。,21,想一想:,笔算减法要注意什么?,1.,相同数位要对齐,;,2.,从个位减起,;,笔算两位数减法,要记,住二条,:,计,算,
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