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在實習期間,我教了一班小二數學科,其中一個課題是分辨梯形和其他四邊形。


對於小二的學生來說,由於他們並未學習“平行”的概念,所以無法用此概念來讓


學生得知梯形就是有一組對邊平行來分辨梯形和其他四邊形。因此,在諮詢過老


師的意見後 在教學上加入多種不同類型的梯形讓學生能夠更在這些外形不一、
     ,


大小不一、平行的對邊方向不一的梯形,讓學生能夠從這些不同的梯形中,慢慢


建立甚至抽象出“平行”的概念。



本人利用軟件 geogebra 製作出不同類型的梯形,因為如果利用傳統的教材,例


如:梯形卡紙、頂板等等難以做出多種不同的梯形。這是為什麼需要應用該軟件


的主要原因。另外,由於實習學校的電腦不能直接開啟 geogebra 。因此 ,本人


將 geogebra 製作出的梯形圖案放進 powerpoint 中做教學。



本人利用了以上兩種軟件,輔以工作紙,要求學生從 powerpoint 顯示的多種不

同的四邊形圖案中,找出梯形 ,然後讓他們歸納出這些不同的梯形有什麼共通


點和有什麼不同的地方。從而幫助學生建立平行的概念,讓他們能夠分辨出梯


形。

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