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      歡迎來到原中小學教育資源網!

      三年級上冊秒的認識課件

      課件 時間:2018-02-24 我要投稿
      【www.51cxty.com - 課件】

        教學目標

        1.通過觀察自主認識新的時間單位:秒,知道1分=60秒.

        2.通過動手操作等豐富的學習活動,建立1秒及幾秒的時間觀念.

        3.通過多媒體課件演示及學生的動手操作等學習活動,激發學習學習興趣,明確珍惜時間的重要性.

        教具

        鐘面、多媒體計算機軟硬件一套.

        學具

        口算練習紙每人一張、自備水彩筆、剪刀、白紙、蠟光紙等.

        教學過程

        一. 導入

        1、(播放音頻“滴答”)請小朋友仔細聽一聽,這是什么聲音?

        2、(演示動畫“時鐘”)再請小朋友仔細地看一看,看到什么?

        3、今天這節課,我們就學習有關秒的知識.(板書課題:秒的認識)

        二. 新課

        (一) 鐘面上的秒

        1、你知道秒針是怎樣計時的嗎?請你仔細觀察,把看到的告訴大家.(秒針走5小格)

        揭示:秒針走一小格的時間是1秒.

        2、(秒針從數字12走到數字6)這表示經過幾秒?

        (從數字6走到數字8)這一次表示經過了幾秒?輕輕告訴同桌的小朋友你是怎么看的.你還知道秒針從哪兒走到哪兒也是10秒?上來指一指.

        3、(播放動畫“60秒”)這次表示經過多長時間呢?

        (1分=60秒)

        從鐘面上看一看是不是這樣呢?你是怎么看出來1分=60秒的?

        4、1分就是60秒,那我們平常說的"半分鐘"呢?(30秒)

        (二) 體會1秒

        1、1秒到底有多長呢?

        讓我們再來閉上眼睛,仔細聽一聽.

        鐘表發出"滴答"一聲所經過的時間就是1秒.

        2、請小朋友來做一個拍手練習,每秒拍一下手,看看誰拍得最準.

        先自已試一試.

        3、誰來試一試? 誰還能不看鐘,來拍一拍,其他小朋友可以提醒他.

        4、每秒數一數,看看數到10的時候,是不是正好10秒?又相差了多少?

        同桌的兩個小朋友,互相比一比.

        5、剛才哪些小朋友數得比較準,你愿意上來表演一下嗎?

        6、小結:剛才,我們聽到鐘聲"滴答"就是1秒,拍下手是1秒,數一個數也是1秒.你能做一動作來表示1秒嗎?(小組討論)

        7、1秒鐘確實很短,但是有些現代化的工具1秒鐘卻能做很多事情呢.現代化工廠的流水線上一秒鐘可以生產出成千上萬個零件.有的電腦一秒鐘可以完成3萬億次運算等等.

        所以,你可別小看了這短短的1秒鐘呀,幾個1秒鐘連起來就能做更多的事情啦.

        (三) 體會幾秒

        1、現在就給你30秒鐘,請你測一測你的脈搏跳了多少下.

        2、我們平時每天都要來做口算,口算的要求是又對又快,現在我們就來進行一次"半分鐘口算比賽".比一比誰作對的題最多,我們將評出今天的"口算之星".

        3、其實呀,做每一件事都要花一定的時間,就連我們在不經意間作一次深呼吸,也要花好幾秒鐘呢,你知道怎樣是一次深呼吸嗎?

        做一次深呼吸,看看用了幾分鐘.

        4、你還知道生活中哪些事情可以用秒來計算時間嗎?

        請小朋友在較短的時間里完成一件有意義的、你最拿手的事,看看你用了多少秒鐘,比比誰做得又快又好.

        5、今天,我們學習了什么?通過剛才的學習你知道了什么?

        有了秒針,計時就更準確了,時針.分針.秒針在時間王國里分工合作,準確地為人們報時.

        (播放視頻“王麗萍”) 悉尼奧運會上,中國選手王麗萍榮獲女子20公里競走的冠軍,你知道她奪冠的成績嗎?(1小時29分05秒)

        三.總結

        到現在為止,你已經認識了哪些時間單位?

        四. 練習

        1、在( )里填上小時.分或秒

        (1) 我們上一節課的時間是40( )

        (2) 夏天我們午睡的時間是40( )

        (3) 小明跑100米要用19( )

        2、在一些國際比賽中,競爭就更加激烈了.(播放視頻“男子100米跑”)這是悉尼奧運會男子100米決賽的精彩畫面.冠亞軍之間相差的時間1秒鐘都不到,只有0.12秒.

        3、下課鈴聲響了,請大家安靜.迅速地將文具整理好,放在文具袋中,看看需要多少時間,相信大家今后每時每刻都能這樣珍惜分分秒秒,做時間的主人.

        板書設計:略.

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