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      歡迎來到原中小學教育資源網!

      《扇形統計圖》教案課件

      課件 時間:2017-06-23 我要投稿
      【www.51cxty.com - 課件】

        引導學生了解扇形統計圖的特點、意義、作用;會看扇形統計圖,會制作扇形統計圖,會分析。下面瑞文網小編為大家整理了《扇形統計圖》教案課件。

        教學目標

        1、通過實例,認識扇形統計圖,了解扇形統計圖的特點與作用。

        2、能讀懂扇形統計圖,從中獲取有效信息,體會統計在現實生活中的作用。

        教學重點

        通過實例,認識扇形統計圖,了解扇形統計圖的特點與作用。

        教學難點

        能讀懂扇形統計圖,從中獲取有效信息,體會統計在現實生活中的作用。

        教學過程

        一、談話導入新課

        師:課前袁老師讓大家收集生活中的一些統計圖,我們一起來看看同學們都收集了哪些?(展示學生作業,請學生介紹自己收集的統計圖。)

        教師適機提問:這樣的統計圖有什么特點呢?

        生:條形統計圖可以清楚的看出數量的多少,折線統計圖不僅可以看出數量的多少還可以看出數量的增減變化情況。

        師:說的不錯。現在老師要考考大家會不會用。下星期我們學校將舉行秋季運動會,如果我們繪制一幅統計圖,要能清楚的反映同學們喜歡各項體育運動的人數,你們認為應該繪制什么樣的統計圖比較合適呢?

        生:條形統計圖。

        師:嗯,不錯!條形統計圖可以清楚的反映出數量的多少。如果我想繪制一幅統計圖來表示今天24個小時的氣溫變化情況,用什么統計圖合適呢?

        生:折線統計圖。

        師:嗯,老師也同意,折線統計圖不僅可以看出數量的多少還可以看出數量的增減變化情況。

        老師還發現有同學找了這樣一些圖,我們來看看。(對收集這些圖的學生提問)你能給大家說說你找的是什么圖?

        學生回答。

        師:這樣的圖也是統計圖?那今天我們就來認識認識它,一種新的統計圖。

        師板書:扇形統計圖

        師:從這個題目中,你想學到哪些知識?

        預設:(1)扇形統計圖有哪些特點?(2)什么叫扇形統計圖?

        (3)怎樣作扇形統計圖?(4)扇形統計圖有什么作用?

        二、合作交流,探究新知

        1、說一說

        師:同學們真好學,想知道的可真多啊!那我們就從我國居民平衡膳食寶塔圖開始來了解吧。(課件出示)聽了關于我國居民平衡膳食寶塔圖的介紹,同學們能不能從這個寶塔圖中知道我們需要的哪種食物最多?其次呢?接著呢?

        看了這幅圖,你對同學們的飲食有什么建議呢?

        師:是呀,膳食寶塔圖各層位置和面積的不同反映出各類食物在膳食中的地位和應占的比重。這說明了我們要注意健康飲食。接下來我想請同學們看看笑笑她們家的飲食情況。

        課件出示笑笑家一天各類食物的攝入量統計表

        師:請同學們讀一讀統計表,在小組里互相說一說表中百分數的意思。

        (學生交流完后,教學利用隨機點名請幾位學生說一說各百分數的意思)

        師:表格中的總攝入量是指什么?100%是什么意思?

        通過大家對這些百分數的解釋,那笑笑家一天各類食物的攝入量是否符合膳食寶塔圖的結構呢?

        2、引導討論。

        師:大家看,袁老師根據剛才的統計表中是數據重新繪制了一個圖,你能看懂嗎?

        請同學們先仔細觀察,你看懂了什么。

        根據老師的溫馨提示單想一想,在小組里交流交流。

        (1)根據數據將圓分成了幾部分?每個部分像什么形狀?圖中的各個扇形分別代表了什么?

        (2)在這個扇形統計圖中,用整個圓表示什么?所有的百分數之和是多少?能對應的上統計表中的總攝入量為100%嗎?

        師:現在把你們小組交流的學習成果和大家一起分享吧。

        3、了解特點。

        師:同學們對這幅扇形統計圖分析的很透徹,想一想,我們能從中獲得哪些信息?

        師:能不能用條形統計圖來表示笑笑家一天食物的攝入量呢?為什么?(條形統計圖只能表示出各類食物的攝入量是多少,不能表示出各類食物的攝入量與總攝入量之間的關系,這也是條形統計圖所沒有的功能,而扇形統計圖可以。)

        扇形統計圖有什么特點?小組先討論一下,然后匯報。

        老師小結:

        (1)扇形統計圖能夠直觀地表示整體與部分之間的關系。(直觀表現在哪里?---扇形表示部分,圓表示整體)也就是能清楚地看到各類食物的攝入量占總攝入量的百分比。

        三、鞏固練習,提升反饋

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