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师:同学们!这堂课我们一起来做个数学游戏,好不好?生:好!师:请一位同学在黑板上写上任意的3个五位数,老师再写上两个五位数后,老师不作计算就能回答出五个五位数的和。(指名学生甲上黑板写三个五位数)学生板书出三个五位数:42870……①60014……②81003……③接着老师板书两个五位数:57129……④39985……⑤师:我已知道了这五个五位数的和是281001。生:老师,准对吗?(持怀疑态度)师:准对!不信,你们一起来计算出它们的和。(全班学生认真细心地计算着)生甲:老师,我算好了。它们的和确实是281001。生乙:是281001。生:老师你怎能一下子就知道它们的和的呢?师:好!我来揭开这个谜。(老师把自己写的两个五位数分别写在学生写
Teacher: Classmates! This class we work together to be a math game, okay? Student: Good Teacher: Ask a classmate on the blackboard to write any 3 five-digit, the teacher write two five After the count, the teacher can answer the sum of the five five figures without a calculation. (Named student a blackboard to write three five-digit) Student board out three five digits: 42870 ... ① 60014 ...... ② 81003 ...... ③ then the teacher's board two five-digit: 57129 ...... ④ 39,985 ...... ⑤ division: I already know that the sum of the five five digits is 281001. Health: Teacher, right? (Skeptical) Teacher: Right! No, you work together to calculate their sum. (The class is carefully and carefully calculated.) A: Teacher, I figure it out. Their sum is indeed 281001. Health B: is 281001. Health: Teacher, how can you know the sum of them all at once? Teacher: Well! I'll reveal the mystery. (The teacher writes the two five digits he wrote separately to the student