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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,*,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,*,*,课前复习,32+20=16+8 =,44+5 =20+30=,31+10=52+6 =,15+9 =23+5 =,61+7 =50+20=,32+20=52 16+8 =,44+5 =20+30=,31+10=52+6 =,15+9 =23+5 =,61+7 =50+20=,32+20=52 16+8 =24,44+5 =20+30=,31+10=52+6 =,15+9 =23+5 =,61+7 =50+20=,32+20=52 16+8 =24,44+5 =49 20+30=,31+10=52+6 =,15+9 =23+5 =,61+7 =50+20=,32+20=52 16+8 =24,44+5 =49 20+30=50,31+10=52+6 =,15+9 =23+5 =,61+7 =50+20=,32+20=52 16+8 =24,44+5 =49 20+30=50,31+10=41 52+6 =,15+9 =23+5 =,61+7 =50+20=,32+20=52 16+8 =24,44+5 =49 20+30=50,31+10=41 52+6 =58,15+9 =23+5 =,61+7 =50+20=,32+20=52 16+8 =24,44+5 =49 20+30=50,31+10=41 52+6 =58,15+9 =24 23+5 =,61+7 =50+20=,32+20=52 16+8 =24,44+5 =49 20+30=50,31+10=41 52+6 =58,15+9 =24 23+5 =28,61+7 =50+20=,32+20=52 16+8 =24,44+5 =49 20+30=50,31+10=41 52+6 =58,15+9 =24 23+5 =28,61+7 =68 50+20=,32+20=52 16+8 =24,44+5 =49 20+30=50,31+10=41 52+6 =58,15+9 =24 23+5 =28,61+7 =68 50+20=70,100,以内的加法和减法(二),1.,两位数加两位数,不进位加法,1.,能正确的列竖式计算两位数加两位数(不进位)。,2.,理解两位数加两位数的算理。,教学目标,理解两位数加两位数的算理。,掌握列竖式的方法。,教学重、难点,35,32,(人),3 5,+3 2,写竖式时,是从哪位加起的?,相同数位要对齐。,6 7,从个位加起。,67,列竖式计算需要注意什么呢?,1.,相同数位对齐。(个位和个位对齐,十位和十位对齐),2.,从个位开始算起。个位相加的和写在个位的下面。十位相加的和写在十位的下面。,你学会列竖式计算两位数加两位数?,巩固练习,32+26=24+53=55+32=46+23=42+37=37+61=75+14=18+81=,32+26=,24+53=55+32=46+23=42+37=37+61=75+14=18+81=,32+26=58 24+53=7755+32=46+23=42+37=37+61=75+14=18+81=,32+26=58 24+53=7755+32=87 46+23=42+37=37+61=75+14=18+81=,32+26=58 24+53=7755+32=87 46+23=6942+37=37+61=75+14=18+81=,32+26=58 24+53=7755+32=87 46+23=6942+37=79 37+61=75+14=18+81=,32+26=58 24+53=7755+32=87 46+23=6942+37=79 37+61=9875+14=18+81=,32+26=58 24+53=7755+32=87 46+23=6942+37=79 37+61=9875+14=89 18+81=,32+26=58 24+53=7755+32=87 46+23=6942+37=79 37+61=9875+14=89 18+81=99,小结,这节课我们都学习了什么?你学会了吗?,(学习了,列竖式计算两位数加两位数的不进位加法。),列竖式应该注意什么呢?,(个位和,个位,上的数对齐,十位和,十位,上的数对齐,,相同,数位上的数相加,从,个位,算起。),课堂小测试,一、笔算,加法要注意,:,1.,个位和,(),上的数对齐。,十位和()上的数对齐。,个位,十位,2.,相同数位上的数()。,对齐,3.,从()算起。,个位,OK,!,二、笔算,下面各题:,(,1,),25+63=,(,4,),32+18=,二、笔算,下面各题:,(,1,),25+63=,(,4,),32+18=,二、笔算,下面各题:,(,1,),25+63=,(,4,),32+18=,二、笔算,下面各题:,(,1,),25+63=,(,4,),32+18=,二、笔算,下面各题:,(,1,),25+63=,(,4,),32+18=,二、笔算,下面各题:,(,1,),25+63=,(,2,),45+44=,(,3,),73+5,=,(,6,),9 +50=,(,5,),37+30=,(,4,),32+18=,二、笔算,下面各题:,(,1,),25+63=,布置作业,1,、列竖式计算,32+16=24+33=,59+40=20+67=,33+25=30+18=,2,、二(,1,)班有男生,26,人,女生,22,人,二(,1,),班一共有多少学生?,3,、商店里卖出了,44,个西瓜,还有,35,个,商店,里原来有多少个西瓜?,
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