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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,*,*,*,*,*,*,*,*,整十数加一位数及相应的减法,SJ,一年级下册,三 认识,100,以内的数,1. 3,个十和,2,个一合起来是（,）。,2. 5,个十和,8,个一合起来是（ ）。,3. 46,里面有（ ）个十和（ ）个一。,4. 28,里面有（ ）个十和（ ）个一。,32,58,4,6,2,8,课后作业,探索新知,当堂检测,课堂小结,整十数加一位数及相应的减法,1,课堂探究点,2,课时流程,30,4 =,34,30 =,34,4,加数,加数,和,被减数,减数,差,探究点 整十数加一位数及相应的减法,4,30 =,34,34,4 =,30,小试牛刀,（教材,P26,试一试）,1,.,46,40,46,40,6,40,6,40,=,6,46,6,46,=,=,=,小试牛刀,（教材,P26,想想做做）,2,.,60,3,+,=,3,60,+,=,63,60,=,63,3,=,63,63,3,60,50,9,+,=,9,50,+,=,59,50,=,59,9,=,59,50,59,9,70,8,+,=,8,70,+,=,78,70,=,78,8,=,78,78,8,70,3,.,72,50,4,37,68,4,70,2 =,74,70 =,60,8 =,56,6 =,7,30 =,84,80 =,4,.,加 数,加 数,和,被减数,减 数,差,30,9,7,40,8,50,52,50,4,64,98,90,39,47,58,2,60,8,5,.,写出相邻的两个数。,67,69,80,82,98,100,，,68,，,，,81,，,，,99,，,6,.,20,个,（个）,20,4,24,7,.,一共要搬,38,把椅子。,已经搬了,30,把。,还要搬多少把？,（把）,38,30,8,(1),(2),小试牛刀,（源于,典中点,）,20,3,23,50,3,20,23,8,58,8,50,58,2,25,20,46,6,73,70,25,5,46,40,73,3,5,20,40,6,3,70,3,(1)40,5,(,),，加数是,(,),，和是,(,),。,(2)72,2,(,),，被减数是,(,),，减数是,(,),，差是,(,),。,45,40,和,5,45,70,72,2,70,几十加几等于几十几，几加几十等于几十几。几十几减几等于几十，几十几减几十等于几。,归纳总结：,（讲解源于,点拨,）,3.,80,5,56,50,62,2,96,90,3,50,2,80,20,6,28,8,73,3,85,6,60,6,53,82,26,20,70,夯实基础,（教材,P28,练习五）,4.,20,8,5,5.,老猫和小猫一共钓了,29,条鱼。小猫钓了多少条？, （条）,29,20 9,4,4,60,2,70,5,30,40,6,20,7,50,3,易错辨析,（选题源于,典中点,）,辨析：在计算一位数加整十数时，看错导致错误,64,72,35,46,27,53,
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