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教学内容:北师大版教材四年级下册第七单元“认识方程”第一课时“字母表示数”。教学片段一:(课件播放一个小女孩唱青蛙儿歌的声音,同时文字不断向上滚动:1只青蛙1张嘴,2只青蛙2张嘴……学生不由自主地随着声音轻唱)师:让我们在这首儿歌声中来一次“巧算24”。(关闭儿歌的声音,课件出现13张扑克牌覆盖青蛙儿歌,将A、2、3、4四张扑克牌移下来,请两名学生试算)生:3×4×2×1=24。生:(1+2+3)×4。师:两位同学都用到了1,四张牌中没有1呀?
Content: Beijing Normal University version of the fourth grade textbook seventh unit “cognitive equation ” the first class “number of letters ”. Teaching a fragment: (courseware to play a little girl singing frog children’s songs, while the text continues to scroll up: 1 frog 1 mouth, 2 frogs 2 mouth ... Students involuntarily with the sound of the song) Teacher: Let’s here First song in a song “clever calculation 24 ”. (Close the voice of children’s songs, courseware appears 13 cards covering frog children’s songs, the A, 2,3,4 four poker cards removed, please try two students) Health: 3 × 4 × 2 × 1 = 24. Students: (1 + 2 + 3) × 4. Teacher: Two students have used a 1, four card no 1 ah?