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3DPEN-Lesson 1


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教學綱要

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科 目: 數學

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年 級: 小學五年級

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日 期: 2017222

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課 題: 立體圖形

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節 數: 一節 (35 分鐘)

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教學目標:

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1. 學生能用三維立體打印筆繪製出四角柱體。

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2. 學生能準確數出四角柱體側面和底的數目。

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3. 學生能用三維立體打印筆繪製出三角柱體。

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4. 學生能準確數出三角柱體側面和底的數目。

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5. 學生能分析立體圖形名稱與其側面數的關係。

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教學過程

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備註/時間

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一、課前重温

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此課節為整單元的第一節,老師宜與學生重温已有知識,了解學生對柱體的掌握程度。

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1. 老師展示一個紙巾盒、三角朱古力及熊仔餅盒,並提問學生︰

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1.1 這些是哪一類型的立體圖形呢?

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1.2 為甚麼這些都叫柱體呢?

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1.3 你憑甚麼得知這些是柱體,而不是錐體,又不是球體呢?

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2. 老師總結指以上立體皆為柱體,並點出此本節重點於繪製柱體及柱體的特性。

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(2分鐘)

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紙巾盒(長方體)、三角朱古力(三角柱體)和熊仔餅盒(六角柱體)

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二、學生能用三維立體打印筆繪製出四角柱體。

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1. 老師派發立體打印筆,讓學生以二人一組,嘗試繪畫長方體。

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1.1 老師請學生把紙巾盒這個立體繪製出來。

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(老師不宜說,請把四角柱體畫出來。)

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1.2 老師可巡視觀察,不宜直接指導學生繪製的方法,但可多留意學生繪製的程序。

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1.3 當第一位學生繪製完成,可讓第二位學生繪製。

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(8分鐘)

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以二人為一組,每位同學有4分鐘,繪製一個四角柱體。

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學生在早前已有機會在小息、午息時,嘗試使用立體打印筆繪製圖案,但老師並沒有教授學生繪製立體。

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三、學生能準確數出四角柱體側面和底的數目。

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  1. 老師見大部份學生能畫出立體後,老師可結束活動,並提問︰
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1.1 這個好像紙巾盒立體,在數學上叫作甚麼名稱呢?

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1.2 為甚麼這個叫立體叫作四角柱呢?

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(這題問可多問幾位學生以評估學生對立體的概念)

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1.3 這個立體有八個頂,哪為甚麼這不叫作八角柱呢?

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2. 老師經過簡單提問後,可帶學生進入數面的環節。老師請學生拿起立體,先說明立體的面可分為側面和底,然後請學生,依老師的示範觸摸立體的每一個側面,並數著14。老師示範一次後再請學生一起多數一次。最後 把資料記錄在黑板上。過程中可提問︰

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2.1 一共有多少個側面呢?

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2.2 側面的形狀是相同的嗎?

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2.3 這些是甚麼形狀呢?

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2.4 把立體橫放後,側面的位置有變嗎?

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3. 最後老師請學生一起數數底的數量同樣以手指觸摸兩個底。指出這個四角柱體有2個底,上剛才的4個側面,共有6個面。最後把資料記錄到黑版。

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(7分鐘)

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黑板處理︰

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四角柱

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側面

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4

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2

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4+2=6

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要求學生用手觸摸立體是非常重要。因為使用三維打印筆繪製的立體並沒有面的,觸摸的動作能彌補這方面的不足。

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四、學生能用三維立體打印筆繪製出三角柱體。

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1. 老師再請學生使用立體打印筆,以二人一組,嘗試繪畫三角柱體。可請剛才後畫的學生在這個部分中先畫,而剛才先畫的學生則從旁協助。

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1.1 老師請學生把三角朱古力這個立體繪製出來。(老師不宜說,請把三角柱體畫出來。)

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1.2 老師可巡視觀察,不宜直接指導學生繪製的方法,但可多留意學生繪製的程序。

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1.3 當第一位學生繪製完成,可讓第二位學生繪製。

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(8分鐘)

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以二人為一組,每位同學有4分鐘,繪製一個三角柱體。

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五、學生能準確數出四角柱體側面和底的數目。

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  1. 老師見大部份學生能畫出立體後,老師可結束活動,並提問︰
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1.1 這個好像三角珠古力的立體,在數學上叫作甚麼名稱呢?

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1.2 為甚麼這個叫立體叫作三角柱呢?

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2. 老師經過簡單提問後,可帶學生進入數面的環節。這次可讓學生自行數一數有多少個側面和底,並提問︰

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2.1 一共有多少個側面呢?

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2.2 側面的形狀是相同的嗎?

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2.3 這些是甚麼形狀呢?

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2.4 把立體橫放後,側面的位置有變嗎?

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3. 最後把資料記錄到黑版。

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(5分鐘)

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三角柱

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四角柱

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側面

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3

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4

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2

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2

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3+2=5

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4+2=6

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六、學生能分析立體圖形名稱與其側面數的關係。

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1. 可先讓學生討論,若我們要畫一個5角柱體,應怎樣去畫出來呢?

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2. 老師把預先準備的五角柱發給學生(每組一個),然後向學生提向︰

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2.1 這個五角柱的底是甚麼形狀呢?

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2.2底有多少個呢?

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2.3這個五角柱有多少個側面呢?

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2.3 它們都是甚麼形狀呢?

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3. 老師把他們說出的答案寫好後,便可提問︰

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3.1 雖然我們沒有見到6角柱,但你知道它有多少個側面嗎?

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3.2 6角柱又有多少個底呢?

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3.3 你知到它的面數又是多少?

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總結和歸納︰

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最後老可總結︰在一個柱體中,底的數量永遠也是二,而側面的數量則與它的名稱相同,也即是底邊的數。

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(5分鐘)

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三角柱

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四角柱

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五角柱

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側面

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3

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4

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5

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2

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2

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2

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3+2=5

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4+2=6

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5+2=7

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DMU Timestamp: November 27, 2019 01:26

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