整十數加、減整十數,情境導入,探究新知,課堂小結,課后作業,100以內的加法和減法（一）,課堂練習,4,40座,30座,情境導入,小朋友們去郊游，準備了這兩輛車！,40座,30座,探究新知,70,40,1.,90,40,50,90,50,90,40,50,課堂練習,5,50,2.,4,40,9,90,8,80,3.,50,80,10,70,30,40,60,10,40,46,3.,60