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數學科教案



教師:何緯邦                           任教學校:佛教陳榮根紀念學校
日期及時間:24/4/2012(11:00 -11:35 )   年級:    1     學期: 下學期
                (11:35-12:10)
範疇::數                            單元:   1N5   加和減(一)
課題::連減法(第 16 課)                  教節:    2 教節( 70 分鐘)



學生已有知識:


     1.    掌握 18 以內減法
     2.    認識「被減數」「減數」和「差」
                    、
     3.    掌握以算柱協助運用二位數減一位數及二位數減二位數(不退位)
     4.    掌握以直式運算二位數減一位數及二位數減二位數(不退位)
     5.    認識「被減數」「減數」和「差」
                    、
     6.    掌握以算柱協助運用二位數減一位數(不退位)
     7.    掌握以直式運算二位數減一位數(不退位)
     8.    認識減法應用題相差和取去題型


學習目標:


     1.    認識連減法
     2.    認識破十(18 以內運算)
     3.    掌握以手指協助運算破十(18 以內運算)



教學資源運用:


1.        電腦
            i.    電子簡報
            ii.   電子書
           iii.   電子算柱
2.        白板
3.        工作紙
時間   教學成果      教學活動   指示/提問/講述/評估/示範           安排
10   重溫上堂      回顧     -   重溫大雄例子        工作紙
     知識               -   重溫「被減數」需要大於「減
                          數」才能夠計算
                      -   以電子算柱作演練      電子算柱
                      -   設三題題目讓學生決定能否
                          計算
                      -   邀請學生以電子算柱作示範
7    認識連減      發展一    -   以加菲貓食田裡吃生果為例         簡報
     法                -   問學生如何例出算式?
                      -   帶出連減法
                      -   在白板展示直式和橫式計算
                      -   再以一例示範
10   鞏固連減      鞏固     -   和學生一同完成 P.16 至 P.17 的 電子書
     法                    例題
                      -   然後給予 1 分鐘的時間完成課
                          堂研習
                      -   請學生出來展答案
10             發展二    提問﹕                簡報和投
                      - 展示 11 至 18 的減法算式 影機
                      - 所有算式都會減一位數,而且
                        減數個位數字都是大於被減
                          數的個位數字
                      -   抽取一題 14-9 問題
                      -   問學生答案是多少?用甚麼
                          方法求出答案?
                      -   問有沒有其他同學使用其他
                          方法?
                      -   指出可以用二種方法求得答
                          案:數條、記憶
                      -   指示學生完成 P.15 表
     認識破十             -   引入「破十」
     (18 以內)          -   指出和合十很相似
                      -   問學生 11 是由 10 加上多少組
                          成?問學生直至 18
                      -   以 14-9 的題目以破十方法完
                          成一次,並以實物作展示並同
                          時在白板展示樹形圖
-   將 14 分斥成 10+4
                   -   問學生 4 能夠減 9?
                   -   問學生 10 能夠減?
                   -   最後將 1 加 4 得到答案
                   -   再展示一例
8             鞏固   -   派發工作紙               電子書
     鞏固破十          -   展示學生以破十方法完成
     的認識           -   按完成圖表
                   -   然後核對答案              投影機
                                           巡視
5             活動   提問﹕
     掌握以手          -   問學生如果每次使用破十   簡報
     指協助運              時,都要先畫圖表會不會太浪
     算破十(18            費時間?或者在腦海內聯想  投影機
     以內運算)             圖表較難?
                   -   教授一方法幫助聯想
                   -   問食指指甲像甚麼數字?
                   -   指出當我們計算時需要例寫
                       直式或橫式,展示 15-7
                   -   以食指按著兩位數的個位數
                       字,問學生現在數字變成多
                       少?
                   -   指示學生腦內想像 10-7=3
                   -   放開手指後看見 5 字,腦海將
                       5+3=8
                   -   再以一例示範
                   -   和學生重溫一次步驟
12   掌握以手     鞏固   -   進行一活動             電子書
     指協助運          -   二人一組,分 1 號和 2 號同學 巡視
     算破十(18        -   給了一分鐘時間,首先由一號
     以內運算)             同學以破十方法完成問題,及 投影機
                       填寫空格
                   -   然後在 30 秒內向 2 號同學說
                       出使用破十步驟
                   -   2 號同學詅聽 1 號同學說話,
                       有無出錯,如果錯了告訴 1 號
                       同學哪裡出錯
                   -   第二回合由 2 號同學開始
-   進行 3 輪
8   提醒學生   總結及安   -   重溫重點            電子書
    本節課知   排功課    -   連減法的運算步驟
    識             -   問學生何時可以使用破十
                  -   破十計算步驟
                  -   完成課堂學習冊 P.6-7

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數學科教案 第十六堂(減法二)

  • 1. 數學科教案 教師:何緯邦 任教學校:佛教陳榮根紀念學校 日期及時間:24/4/2012(11:00 -11:35 ) 年級: 1 學期: 下學期 (11:35-12:10) 範疇::數 單元: 1N5 加和減(一) 課題::連減法(第 16 課) 教節: 2 教節( 70 分鐘) 學生已有知識: 1. 掌握 18 以內減法 2. 認識「被減數」「減數」和「差」 、 3. 掌握以算柱協助運用二位數減一位數及二位數減二位數(不退位) 4. 掌握以直式運算二位數減一位數及二位數減二位數(不退位) 5. 認識「被減數」「減數」和「差」 、 6. 掌握以算柱協助運用二位數減一位數(不退位) 7. 掌握以直式運算二位數減一位數(不退位) 8. 認識減法應用題相差和取去題型 學習目標: 1. 認識連減法 2. 認識破十(18 以內運算) 3. 掌握以手指協助運算破十(18 以內運算) 教學資源運用: 1. 電腦 i. 電子簡報 ii. 電子書 iii. 電子算柱 2. 白板 3. 工作紙
  • 2. 時間 教學成果 教學活動 指示/提問/講述/評估/示範 安排 10 重溫上堂 回顧 - 重溫大雄例子 工作紙 知識 - 重溫「被減數」需要大於「減 數」才能夠計算 - 以電子算柱作演練 電子算柱 - 設三題題目讓學生決定能否 計算 - 邀請學生以電子算柱作示範 7 認識連減 發展一 - 以加菲貓食田裡吃生果為例 簡報 法 - 問學生如何例出算式? - 帶出連減法 - 在白板展示直式和橫式計算 - 再以一例示範 10 鞏固連減 鞏固 - 和學生一同完成 P.16 至 P.17 的 電子書 法 例題 - 然後給予 1 分鐘的時間完成課 堂研習 - 請學生出來展答案 10 發展二 提問﹕ 簡報和投 - 展示 11 至 18 的減法算式 影機 - 所有算式都會減一位數,而且 減數個位數字都是大於被減 數的個位數字 - 抽取一題 14-9 問題 - 問學生答案是多少?用甚麼 方法求出答案? - 問有沒有其他同學使用其他 方法? - 指出可以用二種方法求得答 案:數條、記憶 - 指示學生完成 P.15 表 認識破十 - 引入「破十」 (18 以內) - 指出和合十很相似 - 問學生 11 是由 10 加上多少組 成?問學生直至 18 - 以 14-9 的題目以破十方法完 成一次,並以實物作展示並同 時在白板展示樹形圖
  • 3. - 將 14 分斥成 10+4 - 問學生 4 能夠減 9? - 問學生 10 能夠減? - 最後將 1 加 4 得到答案 - 再展示一例 8 鞏固 - 派發工作紙 電子書 鞏固破十 - 展示學生以破十方法完成 的認識 - 按完成圖表 - 然後核對答案 投影機 巡視 5 活動 提問﹕ 掌握以手 - 問學生如果每次使用破十 簡報 指協助運 時,都要先畫圖表會不會太浪 算破十(18 費時間?或者在腦海內聯想 投影機 以內運算) 圖表較難? - 教授一方法幫助聯想 - 問食指指甲像甚麼數字? - 指出當我們計算時需要例寫 直式或橫式,展示 15-7 - 以食指按著兩位數的個位數 字,問學生現在數字變成多 少? - 指示學生腦內想像 10-7=3 - 放開手指後看見 5 字,腦海將 5+3=8 - 再以一例示範 - 和學生重溫一次步驟 12 掌握以手 鞏固 - 進行一活動 電子書 指協助運 - 二人一組,分 1 號和 2 號同學 巡視 算破十(18 - 給了一分鐘時間,首先由一號 以內運算) 同學以破十方法完成問題,及 投影機 填寫空格 - 然後在 30 秒內向 2 號同學說 出使用破十步驟 - 2 號同學詅聽 1 號同學說話, 有無出錯,如果錯了告訴 1 號 同學哪裡出錯 - 第二回合由 2 號同學開始
  • 4. - 進行 3 輪 8 提醒學生 總結及安 - 重溫重點 電子書 本節課知 排功課 - 連減法的運算步驟 識 - 問學生何時可以使用破十 - 破十計算步驟 - 完成課堂學習冊 P.6-7