整十?dāng)?shù)加、減整十?dāng)?shù),情境導(dǎo)入,探究新知,課堂小結(jié),課后作業(yè),100以?xún)?nèi)的加法和減法（一）,課堂練習(xí),4,40座,30座,情境導(dǎo)入,小朋友們?nèi)ソ加危瑴?zhǔn)備了這兩輛車(chē)！,40座,30座,探究新知,70,40,1.,90,40,50,90,50,90,40,50,課堂練習(xí),5,50,2.,4,40,9,90,8,80,3.,50,80,10,70,30,40,60,10,40,46,3.,60