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25 4正方形
1.
教案 教學目的﹕ 1.使學生理解並掌握正方形面積的計算方法. 2. 能正確地計算正方形的面積 已有知識﹕ 1.公認面積單位 2.長方形面積計算 3.正方形的特性 4.單位轉換 資源和器材﹕ Powerpoint (square
area.ppt), 格仔紙 , 工作紙 黑板運用﹕ 日期﹕25 / 4 /2013 時間﹕1 hr 班別﹕4B 課題﹕正方形面積 教師﹕林美玲 學生人數﹕25 人
2.
導引﹕ 時間 備註 老:
我們掌握了面積、面積單位和長方形面積的計算,請同學們回憶以下 幾個問題。 1.什麼叫面積? 答(物體的表面或閉合平面圖形的大小,叫做它們的面積) 2.測量或計算面積時,有哪些常用的面積單位? 答(平方厘米、平方米)—板書 3. 想一想長方形、正方形各有什麼特徵? 答(長方形有四條邊,對邊相等;正方形四條邊都相等) 4.要計算長方形的面積,必須知道哪兩個已知條件? 答(長和寬各是多少) 5.長方形面積公式是? 答(長 X 闊)—板書 3 mins 發展﹕ 時間 備註 1.看圖列式計算長方形面積.(ppt) 投影出示長 6 厘米、寬 2 厘米的長方形.(單位:厘米) (逐步移動長方形的寬,直至使長方形轉化為正方形) 要學生講出該長方形的面積橫式: 長 6 厘米、寬 2 厘米 6×2=12(平方厘米) 長 6 厘米、寬 3 厘米 6×3=18(平方厘米) 長 6 厘米、寬 4 厘米 6×4=24(平方厘米) 長 6 厘米、寬 5 厘米 6×5=30(平方厘米) 長 6 厘米、寬 6 厘米 6×6=36(平方厘米) 7 mins
3.
老﹕長 6 厘米、寬
6 厘米,這是一個什麼圖形?答﹕正方形 老﹕根據觀察,你們發現怎樣計算正方形的面積? 答﹕正方形的面積=邊長×邊長 =邊長自乘 着全班朗讀一次正方形的面積公式。 _________________________________________________________ 2. 老﹕我們利用這個公式,先解決一個實際問題.(出示例題) 例:有一塊邊長是 8 厘米的正方形手帕,它的面積是多少? (學生獨立完成,然後找一位同學出來黑板做。) 答 8×8=64 平方厘米 老﹕你地覺得找出正方形面積容易嗎? 現在有一個難題,老師想知道當周界相同時,長方形和正方形的面 積有何變化。你們分組進行活動,找出答案。 3.小組活動﹕ 全班分五組(已分),着每個組員所負責的長方形形狀不同,,但周界 同樣是 20 厘米。先詢問有哪幾個組合。5 個 周界是 20 厘米的長方形可能組合﹕(長方形的長和闊之和是 10 厘米) 1)1x9 = 9 cm² 2)2x8= 16 cm² 3)3x7= 21 cm² 4)4x6= 24 cm² 5)5x5= 25 cm² 指明幾號同學做第幾題(例﹕1 號做第 1 題),剪貼出該題的長方形圖形, 並記下周界和面積分別的公式和答案。 完成後請一組出來報告。 得出結論﹕當長方形或正方形的周界相同時,面積最大的是正方形。 做完後,着班長將成品將貼在後面壁報板下。 交代﹕老﹕相反,如果面積相同,是長方形或正方形的周界最大呢? 同學可以回家想想。_______________________________________________ ________________ 後備: 難題: 1 米 = 100 厘米 1 平方米= 100 平方厘米? (答案: 1 平方米= 10000 平方厘米) 3mins _______ 2 mins 10 mins 小組活動 時間: 15-20 mins _______
4.
(着他們利用剛學的正方形面積計算方法找出答案) 10 mins 總結﹕ 時間
備註 由學生自己做總結 老﹕問同學學到什麼? 答﹕如何計算正方形面積 正方形面積的公式 相同周界的長方形/正方形,面積最大的是正方形。 3 mins 功課﹕書 p.70-73 補充 p.37 反思﹕在小組活動時,可能指示不太清晰,有組別不清楚要做什麼﹐宜應詢問全班 無問題才可以開始活動。 1 平方米=10000 平方厘米。我說錯了是 1000 平方厘米,但沒有察覺,直至視導 老師堂後向我提出我才知道。須要在明天的數學堂重新說清楚。
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