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,*,两位数加两位数,1,口算:,10+20=40-10=98-8=35-20=8+80=31-8=48-9=78+9=35+3=46-7=98-90=24+9=,33,30,30,90,15,88,23,39,87,38,39,8,二(,4,)班,39,人,二(,3,)班,32,人,二(,2,)班,31,人,二(,1,)班,23,人,检票处,二(,4,)班,39,人,二(,3,)班,32,人,检票处,二(,3,)班、二(,4,)班合乘能坐下吗?,23+30=53,53+1=54,二(,1,)、二(,2,)班,能坐下。,23+31=,32+39,=,30+30=60,2+9=11,60+11=71,二(,3,)、二(,4,)班,合乘坐不下,。,做一做:,53+36=37+54=,32+46=15+65=,80,89,91,78,