苏教版 一年级 数学 下册,4.1 整十数加、减整十数,40座,30座,情境导入,小朋友们去郊游，准备了这两辆车！,40座,30座,探究新知,70,40,1.,90,40,50,90,50,90,40,50,课堂练习,5,50,2.,4,40,9,90,8,80,3.,50,80,10,70,30,40,60,10,40,46,3.,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 =,60,4.,20,20,40,（个）,5.,整十数加、减整十数的方法：,1.想数的组成。,2.想一位数加、减一位数。,课堂小结,这节课你们都学会了哪些知识？,
