一次教学研讨活动,我选择了苏教版四年级下册的《用字母表示数》作为教学内容。在导入时我采用了“数青蛙”这首儿歌,在试教过程中出现了意想不到的问题。课始,我出示了儿歌:一只青蛙一张嘴,两只眼睛四条腿;两只青蛙两张嘴,四只眼睛八条腿……当我提出让学生用一句话表达这首儿歌的意思时,学生有的说:“无数只青蛙无数张嘴,无数只眼睛无数条腿。”有的说:“a只青蛙a张嘴,a只眼睛a条腿。”有的说:“a只青蛙b张嘴,c只眼睛d条腿。” A teaching seminar, I chose the fourth edition of the Sujiao version of “the number of letters” as a teaching content. In the introduction I used “number of frogs ” This song, in the process of teaching appeared unexpected problems. At the beginning of class, I showed my children’s songs: a frog with a mouth, two eyes with four legs; two frogs with two mouths and four eyes with eight legs ... When I asked the students to use one sentence to express the meaning of this song, Some said: “Countless frogs countless mouths, countless eyes countless legs.” Some said: “a frog a mouth, a eye a leg.” Some said: “a Frog b mouth, c eyes d legs. ”