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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,二级,三级,四级,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,二级,三级,四级,五级,*,*,*,*,*,*,*,*,整十数加、减整十数,SJ,一年级下册,四,100,以内的加法和减法（一）,算一算。,2,3,5,4,3,4,6,2,7,4,9,4,4,5,3,9,7,5,课后作业,探索新知,当堂检测,课堂小结,整十数加、减整十数的计算方法,1,课堂探究点,2,课时流程,40,座,30,座,70,40,30 =,(,个,),4,个十加,3,个十得,7,个十，是,70,。,4,3 =,7,40,30 =,70,探究点 整十数加、减整十数的计算方法,40,70,30 =,你是怎样想的？,小试牛刀,（教材,P42,试一试）,1,.,50,40 =,90,40 =,=,=,90,40,50,90,50,90,40,50,小试牛刀,（教材,P42,想想做做）,3,2 =,5,30,20 =,50,2,.,5,1 =,4,50,10 =,40,2,3,4 =,9,20,30,40 =,90,9,3,2 =,8,90,30,20 =,80,3,.,10,60,30,70,60,40,50,80,10,70,30,3,.,40,80,20,50,30,6,40,60,10,40,46,4,.,60,30 =,90,90,70 =,20,20,40 =,60,60,20 =,40,30,30 =,60,70,10 =,60,80,50,7 =,37,10,80,6 =,96,30,70,40 =,60,5,.,我拔的和你同样多。,一共拔了多少个？,=,20,20,40,（个）,1,填一填。,30,50, 想：,(,),个十加,(,),个十是,(,),个十，是,(,),。,40,50, 想：,(,),(,),(,),，所以,(,),(,),(,),。,小试牛刀,（源于,典中点,）,80,3,5,8,80,90,4,5,9,40,50,90,2,填一填。,40,30, 想：,(,),个十减,(,),个十是,(,),个十，是,(,),。,90,20, 想：,(,),(,),(,),，所以,(,),(,),(,),。,10,4,3,1,10,70,9,2,7,90,20,70,3,4,3,6,2,5,4,3,40,30,60,20,50,40,30,7,70,4,40,6,60,1.,整十数加整十数，就是用几个“十”加几个“十”，得几个十就是几十。,2.,整十数减整十数，就是用几个“十”减几个“十”，得几就是几十。注意：个位一定是,0,占位。,归纳总结：,（讲解源于,点拨,）,1.,夯实基础,（教材,P49,练习七）,34,2,34,5,34,20,34,50,36,2,35,2,53,20,35,20,53,61,8,80,17,3,36,37,20,39,54,84,37,55,55,73,69,97,39,57,4,在车厢上填上正确的数。,易错辨析,（选题源于,典中点,）,辨析：符号看错或弄错，导致错误,10,60,50,80,30,100,30,50,40,70,
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