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      歡迎來到原中小學教育資源網!

      人教版一年級數學下學期圖形的拼組的教學反思

      教學反思 時間:2018-08-01 我要投稿
      【www.51cxty.com - 教學反思】

        在大力開展新課程改革實驗教學的今天,為了使學生了解數學并非只是紙上談兵,而是來源于生活,運用于生活,生活中處處離不開數學。使學生在自我探索中學會學習數學,并通過學習數學知識去拓展視野,發散思維,挖掘潛力,從而真正做到學 以至用 。大教育家比提曾經說過:"教育之目的,不在于應該思考什么,而是教人如何思考。"而新的課程理念恰好是以這一目標為終旨,進行教育改革的。所以教師必須按照新課程理念進行教學,用創造性教學喚醒、激發學生的創造力。下面是一個教學片段或許能給大家提供一點有益的啟發:

        本案例是義務教育課程標準實驗教科書《數學》(人教版一年級下冊)中第27頁例2:"圖形的拼組--擺一擺"的教學片段。

        老師:"同學們你們都喜歡過生日么?"

        學生:(齊聲道)"喜歡!"

        老師:"今天可真巧,我們班里有兩位同學過生日。(教師手中拿著蠟燭)而且啊,這兩位同學的年齡加起來,正好是我手中蠟燭的支數,大家數數看。"

        學生:"一支、兩支......十二支。老師,有十二支!"

        老師:"同學們真聰明!你們想知道這兩位同學是誰嗎?現在就請這兩位同學上前來,我們祝他們生日快樂!大家一起唱生日歌好么?"(媒體演示)

        學生:"祝你生日快樂,祝你生日快樂......"

        老師:"大家唱得很好!現在我們要將這十二支蠟燭擺成圖形,大家想一想能擺出幾種圖形?請同學們分組討論一下。"

        (學生們拿出準備好的學具,十二根小棒)頓時,教室里熱鬧了起來,學生們你一言,我一語,你這樣拼,我那樣擺。一會兒后,學生們個個胸有成竹地舉起了手。

        老師:"同學們思考好了嗎?"

        學生:(齊聲道)"好了!"

        老師:"那好,這位同學你來擺一擺。"(媒體演示,讓學生上來擺。)

        學生1:"可以擺成正方形。"

        老師:(板書:"正方形")"你能說說為什么可以擺成正方形嗎?"

        學生1:"因為,正方形的四邊都一樣長,四條邊的小棒的根數也一樣多。"

        老師:"很好!這位同學很聰明!同學們還有別的擺法么?"

        這時,學生們都表現得相當積極,不少同學舉起了手,一位男生大聲道:"還可以擺成長方形!"

        老師:(板書:"長方形")"這位同學說得對!請你站起來告訴大家為什么可以擺成長方形好嗎?"

        學生2:"因為,長方形的對邊小棒的根數也相等。"

        老師:"答對了!請你坐下。同學們,還有別的方法么?"

        這時,另一位女生也不甘勢弱地站起來說道:"還有三角形!"

        老師:(板書:"三角形")"很好!答對了!請同學們再開動腦筋,想想還有沒有別的擺法?"

        學生們在底下熱烈的討論著,不少人你一筆我一劃地擺弄著,有的學生望著手上的小棒做出很迷惘的樣子,課堂氣氛十分熱烈。突然,一位學生興奮地叫著:"我知道了!我知道了!還有一種擺法!"

        老師:"好的!你來擺一擺!"

        學生4:"還可以將6個三角形合在一起!"

        這時,不少學生對于學生4的想法感到很奇怪,臉上露出了疑惑的神情,不少學生則在下面議論紛紛對此持懷疑態度。

        老師:(先板書:"六邊形")"你真聰明!這種擺法很新穎!這個圖形是由6個三角形合成的!大家鼓掌鼓勵這位同學好么?"

        這時,教室里掌聲響成一片,大家露出羨慕的神情,那位學生紅著臉坐下。有的學生頓時感到眼前"豁然開朗",大家興趣盎然,爭先恐后地舉手,想發表自己的意見。

        學生5:(他滿懷信心地走到媒體前演示)拿著十二根小棒擺著,一會兒便擺成了一個梯形。

        學生6:(緊接著,又一名學生不等老師點名走到媒體前演示)他擺出了一個平行四邊形。

        學生7:他拿著十二根小棒,擺成了三個小正方形。

        學生8:他拿著十二根小棒,擺成了四個小三角形。

        突然,一位學生站起來說道:"學生7和學生8的方法跟前面的一樣,不好!這樣容易亂。"

        老師笑瞇瞇地示意他坐下,感到十分高興。

        學生們通過分組討論,在教師的指導下,學生們也明白了用十二根小棒可以擺成正方形、長方形、三角形、六邊形、梯形、平行四邊形。同時,也說明了學生7和學生8的方法僅僅是"換湯不換藥",與原來的方法是一樣的,并不是新的圖形,因此這個方法不可取,在這同時學生們自己也進行了總結,并且,學生們為自己能夠找到如此豐富多采的思考方法,感到無比自豪,同時,允許讓每個學生獲取了許多圖案信息,新穎獨特的教學設計、五彩繽紛的圖案讓學生充分感到幾何美、數學更美。教師對他們的鼓勵,也是讓學生在今后的學習過程中起到推動作用。,這樣以來,激發了學生的求知欲望,大大得提高了課堂教學效果,學生們學得輕松愉快,教效果比以前好上加好。

        通過上面的教學片斷:使我真正懂得了"智慧出自手指上"的含義。學生通過自己動手,自己思考使他們的思考問題的能力到底了進一步的認識,使學生對數學的興趣大大增強,真是一舉兩得!這樣以來給了每個學生一個良好的學習空間,給了學生一個學習的權利,讓他們自己去選擇他們體驗成功的樂趣。同時,讓學生獲得了自主學習的體驗,反思整個教學過程,我有如下心得體會:

        1."良好的開端往往是成功的一半。"

        首先是要激發學生的求知欲望,先讓學生對知識產生疑問,接著他們便會對解決此問題產生興趣。一個剛剛入學不久的小學生,要學習課本上的枯燥無味的知識,這本身就是一種"壓力",但如何將"壓力"轉化成"動力",只有通過教師的努力,通過講故事、做游戲,先讓學生們產生興趣,然后在進行教學,在教學過程(本文來自優秀教育資源網斐.斐.課.件.園)中引導學生自己動手動腦進行思考,給學生創造一個良好的學習氛圍,使他們能夠大膽地常識自己的想法,這才是新的課程教學理念所提倡的新教學方法。特別是學生4的想法,非常新穎,學生對他的擺法由不理解到由教師講解后的明白到為學生4的新穎想法感到驕傲。作為教師應該把握住課堂上的這些機會,在向學生傳授課本知識的同時讓學生做課堂的主導,這樣一來教學效果明顯地提高了不少。

        2.數學來源于生活。

        將課本上的知識生活化,這對于學生來說不僅容新知識易接受,而且記憶深刻,很難忘記。由學生過生日而引出十二根小棒的擺法,它可以擺成正方形、長方形、六邊形、平行四邊形、梯形。在解決問題的同時,學生與學生互相討論,學生與教師進行交流,相互啟發,從而找出更多的學習方法,給學生提供充分的思考空間,讓學生自己去尋找的方法,讓學生自己去發現學習的樂趣。學生自己發現學生7、8的問題,并說出其間的矛盾。課堂里學生們積極發言,而有的老師來不及讓其回答的同學甚至自己上前來發表自己的意見。這樣學生再也不像以前那樣接受"填鴨式"教育,由被動變為主動。學生叢中找到了思路,懂得了手腦結合的重要性。同時作為教師在課堂上更要不斷地鼓勵學生從不同的角度去思考問題,從不同的著手點去深入問題的本質,讓他們在教學中始終作為主體。

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