《小兔请客》PPT课件

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,*,口算。,2+3=9-4=,5+4=8-3=,1+6=6-2=,3+3+4=1+7-5=,10-2-3=7-3+2=,80,10,30,40,20,50,80,70,40,60,100,20,70,30,80,40,拆数游戏,把文字描述的数学写在括号里。,7,个十 （）；,3,个十（）；,4,个十（）；,10,个十（）。,70,30,40,100,拆数游戏,把下面各数拆成整十数,80,，,50,，,40,90,100.,80,里面有,8,个十。,50,里面有,5,个十。,40,里面有,4,个十。,90,里面有,9,个十。,100,里面有,10,个十。,小兔请客,北师大版一年级数学下册,一共有多少个果,个,子,?,20 +30 =,?,(,个,),加数,加数,和,+=,2,个十,5,个十,20,30,?,(,个,),3,个十,50,20,30,?,(,个,),0,0,2,0,3,5,也可以这样算：,我拿走,10,个果子。,还剩下多少个果子,?,50,10 =,?,(,个,),被减数,减数,差,=,5,个十,4,个十,50,10,？,(,个,),1,个十,40,50,10,？,(,个,),0,0,5,0,1,4,也可以这样算：,20,50,60,70,40,30,做加法,试一试，你准行！,50,60,70,80,90,80,50,60,70,40,30,做减法,试一试，你准行！,50,40,30,20,10,30,4,90,50,20,40,70,10,40,20,60,10,60,20,60,20,跷跷板,口算,50,30,30,10,40,50,20,30,30,50-20,10,40+20,50,30,30,10,60,40,40,30,90,50-30,100-40+40,50+30=80,30+10=40,40+50=90,20+30=50,30+50-20=60,10+40+20=70,50-30=20,30-10=20,60-40=20,40-30=10,90-50-30=10,100-40+40=100,本课总结,掌握整十数加、减的计算方法，并能够正确的计算其结果。,你真聪明。,我要说身边的数学。,