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在二年级上册《有趣的七巧板》学完之后,学生很感兴趣,于是我增加了一课时,组织学生从“看图拼图”走向“看影拼图”。以下是“看影拼图——拼蜡烛”环节的教学片段。(出示图1。)师:你能用5块板拼出这幅蜡烛图吗?(学生拼图,教师巡视,两位学生在黑板上展示拼图,分别如图2、3所示。)师:看黑板上的拼图与原来的蜡烛影子图,有什么相同之处,有什么不同之处?生:上面的两块都是平行四边形和正方形。生:下面的3块板选得不一样。生:(指图2)影子图上有突出的角,这个小三角形应该换成大三角形(注:在拼图之前,教师已经带领
After the second grade, “Funny Tangram,” was completed, the students were very interested, so I added a class to organize the students to move from “Puzzle” to “Puzzle”. The following is “See shadow puzzle - spelling candles ” section of the teaching fragment. (Show Figure 1.) Teacher: Can you spell out the candle chart with five panels? (Student puzzles, teacher visits, two students display jigsaw puzzles on the blackboard, as shown in Figures 2 and 3.) Teacher: Look at the puzzle on the blackboard with the original candle shadow map, what are the same, what is the difference? Health: The above two are parallelogram and square. Students: The following three boards are not the same choice. Students: (refer to Figure 2) There are prominent corners on the shadow map, this small triangle should be replaced by a large triangle (Note: Before the puzzle, the teacher has led