在教学“求两数相差多少”的应用题时,为了让学生直观感知数量之间的关系,我安排了让学生操作的环节,本以为会顺利地过去,没想却卡了壳。过程是这样的: 我把5个○和7个□散乱地放在投影仪上,提问学生谁能把它们重新整理一下,使同学们能一眼看出谁多谁少。一女生立即举手,我便请她上来,她是这样摆的:○○○□□□○○……我一 In the teaching of “how many difference between the two numbers,” the application of the problem, in order to allow students to intuitively perceive the relationship between the number, I arranged for students to operate the link, I thought it would be smooth past, did not think it was a card. The process is this: I put 5 ○ and 7 □ loosely on the projector, asking students who can rearrange them so that they can see at a glance who and who is less. A girl raised her hand immediately and I asked her to come up. She was like this: ○○○ □□□ ○○ ...... I