两位数加一位数和整十数的不进位加法.ppt

两位数加一位数和整十数,授课人：宋平阳,4,50,说出下列各数的分成,8,6,口算,40+20,50+30,40+2,50+3,60,90,42,53,数学王国,数学35本,语文30本,语文8本,数学3本,353,8,8,38,3530,3530,3530,60,60,3530,60,60,3530,60,65,60,4017,57,50,236,38,8,39,75,42+3=,42+30=,5+21=,50+21=,45,72,5+21=,50+21=,26,71,34+2=54,5+13=68,40+50=45,64+30=67,36,18,90,94,53+4=,62+7=,5+31=,86+2=,53+20=,20+67=,64+30=,50+31=,57,69,36,88,73,87,94,81,有23个男生,一共有多少个学生？,20+23=43(个),23+20=43(个),我们班有20个女生,想一想：下面每个（）里可以填什么数？61+()70()+558284=()+(),数学王国,再 见,