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一、激趣导入1.老师今天带来一个谜语让你们猜猜:尖嘴巴来叫呱呱,游泳跳高本领大,专吃害虫顶呱呱。这是什么呢?(青蛙)你们是怎么猜出来的?(板书:抓特点)2.出一个公式给你们猜一猜:青蛙能跳到自身长度的()倍。谁再来猜一猜?3.小小的青蛙能跳到自身长度的12倍,多棒啊!这里用了什么样的说明方法?(板书:列数字)因为要捕食田里的害虫,小青蛙比蚱蜢跳
First, the introduction of excitement 1. The teacher today to bring a riddle so that you guess: tip mouth to quack, swimming high jump skills, eat pest top quack. (Frog) How did you guess it? (Blackboard: Grasp Features) 2. Give you a guess: The frog can jump to () times its own length. Who would guess again? 3. Little frog can jump 12 times its own length, how wonderful! What kind of explanation is used here? (Blackboard: Column number) Because of the predation of pests in the fields, Jump than grasshoppers