“你们组怎敢选择估算教学作为展示课啊?那不是自己给自己找麻烦吗?”这样的声音从陈老师一出示《多位数乘一位数的估算》这一课题开始,一直连续不断地响在我的耳旁。为什么不敢尝试?也许是因为我们对估算教学具有畏惧感。为什么要尝试?出于人的好胜本能,总想啃一啃最难咬的骨头。也许我们会困难重重,也许我们可能被碰得头破血流,但唯有这样,我们才能走近估算,走进估算,真正领略到估算的魅力。现将课中的部分片段还原,并附上 “How dare you choose to evaluate teaching as a show class ah? That is not asking yourself trouble?” Such a sound from the teacher to produce a “multi-digit by one-digit estimate” the subject, has been Constantly ringing in my ears. Why not dare to try? Perhaps because of our fear of estimating teaching. Why try? Out of human instinct, always want to eat a bite the most difficult to bite bones. Maybe we will have a lot of difficulties, maybe we may have run into a dilemma, but the only way we can approach estimates, into the estimates, really appreciate the charm of estimation. Part of the lesson is now restored, and attached