小学凑十法和破十法的儿歌及练习题

凑十法儿歌一九一九好朋友，二八二八手拉手。三七三七真亲密，四六四六一起走，9 + 6 = 9 + 5 = 9 + 3 = 9 + 2 = 9 + 8 = 9 + 9 = 8 + 7 = 8 + 9 =