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《從 1 開始》教案和課件
作者:揚州市育才小學 潘菁 點擊數:2126 更新時間:2017年1月7日 文章錄入:智慧數學
   

1 開始》教案

執教:揚州市育才小學  潘菁

教學目標

1. 了解數“1”的發展過程,加深對數“1”的理解,感受其簡潔與方便。

2. 凸顯符號(數字“1”)意識,引領學生體驗從生活具象逐步走向數學抽象。

教學過程

師:先來聽一首兒歌——《數數歌》。

師:小朋友們,小動物一共有幾只?我們也來數一數。剛才數數的時候,是從哪個數開始數起的呢?今天就來跟1交個朋友吧!

師:咱們先了解一下以前的1,看看古時候的人是怎么表示“1”的?

板塊一:古人是怎樣表示“1”的?

示古人手勢表示圖(一只兔子)。

師:這個人抓了幾只兔子?他是怎么表示1的呢?一起跟他學一學。

再分別出示一個小石子(一只羊),繩子打結,一根小木棒,在木板、龜殼、竹棍上刻痕做記號。

師:古時候的人,一開始想到用手勢、小石子、繩結、小棒等表示1,后來,還有人想到用一些刻痕記號表示,再后來有些地方還用了統一的符號來表示,還有很多其它的方法,這些都是古人表示的方法。看到這么多方法,你覺得古人怎么樣?

智慧心語:手勢、小石子、小棒、刻痕、記號……古人是這樣表示1的。

師:古人真聰明啊!小朋友們想不想也來試一試?用你自己的方法來表示1

你想怎樣表示呢?學生自己介紹、展示。

師:這些方法當中,哪種方法最簡單?

板塊二:現在是怎樣表示“1”的?

師:那現在大家怎么表示1呢?

師:大家熟悉嗎?對,就是用阿拉伯數字“1”,這是世界通用的一種表示方法。

師:古人用手勢、找小石子、繩子、小棒來幫忙,把木板、龜殼等物體上刻上印記,再后來為了交流,一些地方用這個記號,還有一些地方用那個記號,等等。看看今天的方法,世界通用的阿拉伯數字。比一比,你感覺我們現在的表示方法怎么樣?

智慧心語:跟古時候相比,我們現在通用的1,既簡單又方便。

板塊三:找找“1”在哪里?

師:生活中哪里有1呢?

示五只小動物圖。

師:找到“1”了嗎?指名說。這里的小動物每種都是幾只?(1只)

示多種物品圖。

師:繼續找一找。誰找到了?指名說。把這幾個物體留下來,把這些物體的樣子跟“1”再比比,有什么發現嗎?(這些物體跟1很像。)

師:是啊!這些物體還真像數字“1”呢!說不定“1”就是這么來的呢!

師:生活中,仔細去看,就能發現很多的1。這些1,可以這樣寫。這是我們寫下來的1,簡簡單單的一筆,千萬別小看這簡單的一筆。想到用這種方法來表示1,可包含著人們無限的聰明才智呢!

智慧心語:1是我們看到的;1是我們寫下來的。

師:繼續來找1。(一顆糖葫蘆、一串糖葫蘆、一把糖葫蘆)

師:一顆糖葫蘆,是15顆糖葫蘆,串成一串,也成了1;幾串糖葫蘆,扎成一把,也成了1

你會用“1”表示嗎?

5根香蕉。

師:你看到了什么?你能把它們也用“1”來表示嗎?

 

從 1 開始》課件

揚州市育才小學 潘菁

注:請您點擊標題后直接打開文檔或者將文檔另存為本地文件后再打開。

   
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