两位数减一位数及整十数.ppt
两位数减一位数和整十数,例1,南充市涪江路小学校 林波,玩 具 店,例1,352,演示1,33,3520,15,演示2,352?,3520?,考考你(口答),764764057357306856850,72,36,54,27,63,18,例2,例2,368,演示,28,怎么算呢?,20,16,8,368?,368?,16,8,考考你(口答),325469578,17,37,49,练习,54,61,93,43,82,24,5退位,246 409 547638 814 603,18,55,31,77,47,57,