<h1 style="margin-top:0;margin-bottom:0;text-align:center"><strong><span style="font-family: 宋体;font-size: 21px">2.1 分数的意义</span></strong></h1><p style="line-height:27px"><strong><span style="font-family: 宋体;font-size: 19px"><span style="font-family:宋体">教学目标：</span></span></strong></p><p style="text-indent:16px;line-height:27px"><span style=";font-family:宋体;color:rgb(51,51,51);font-size:16px">1、知识与技能目标：</span><span style=";font-family:宋体;color:rgb(51,51,51);font-size:16px"><span style="font-family:宋体">理解分数的意义和单位</span>“1”的含义，知道分母、分子的含义和分数各部分的名称，知道生活中分数的广泛用途，</span><span style=";font-family:宋体;font-size:16px"><span style="font-family:宋体">理解并掌握分数与除法的关系，会用分数表示除法的商。</span></span></p><p style="text-indent: 16px;line-height: 27px"><span style=";font-family:宋体;color:rgb(51,51,51);font-size:16px">2、过程与方法目标：</span><span style=";font-family:宋体;color:rgb(51,51,51);font-size:16px"><span style="font-family:宋体">培养学生的分析能力和归纳概括能力。</span></span></p><p style="text-indent: 16px;line-height: 27px"><span style=";font-family:宋体;color:rgb(51,51,51);font-size:16px">3、情感态度与价值观目标：</span><span style=";font-family:宋体;color:rgb(51,51,51);font-size:16px"><span style="font-family:宋体">通过学生的主动探索，培养学生的成功体验，坚定学生学好数学的信心。</span></span></p><p style="line-height:27px"><strong><span style="font-family: 宋体;font-size: 19px"><span style="font-family:宋体">教学重点</span></span></strong><span style=";font-family:宋体;font-size:16px"><span style="font-family:宋体">：</span></span><span style=";font-family:宋体;font-size:16px"><span style="font-family:宋体">建立单位</span>“</span><span style=";font-family:宋体;font-size:16px">1</span><span style=";font-family:宋体;font-size:16px">”的概念</span><span style=";font-family:宋体;font-size:16px"><span style="font-family:宋体">，</span></span><span style=";font-family:宋体;font-size:14px">分数与除法的关系</span><span style=";font-family:宋体;font-size:14px">。</span><span style=";font-family:宋体;font-size:16px">&nbsp;</span></p><p style="line-height: 24px"><strong><span style="font-family: 宋体;font-size: 19px"><span style="font-family:宋体">教学难点</span></span></strong><span style=";font-family:宋体;font-size:16px"><span style="font-family:宋体">：理解分数的意义</span></span><span style=";font-family:宋体;font-size:16px"><span style="font-family:宋体">，</span></span><span style=";font-family:宋体;font-size:14px">用除法的意义理解分数的意义。</span></p><p style="text-autospace:ideograph-numeric;line-height:24px"><strong><span style="font-family: 宋体;font-size: 19px"><span style="font-family:宋体">教具准备</span></span></strong><span style=";font-family:宋体;font-size:16px"><span style="font-family:宋体">：多媒体</span></span></p><p style="text-autospace:ideograph-numeric;line-height:24px"><strong><span style="font-family: 宋体;font-size: 19px"><span style="font-family:宋体">教学过程：</span></span></strong></p><p style="text-autospace:ideograph-numeric;line-height:24px"><strong><span style="font-family: 宋体;font-size: 19px"><span style="font-family:宋体">一、情景导入：</span></span></strong></p><p style="text-indent:24px"><span style=";font-family:宋体;font-size:16px"><span style="font-family:宋体">激情导入：上节课我们认识了</span></span><span style=";font-family:宋体;font-size:16px"><span style="font-family:宋体">分数</span></span><span style=";font-family:宋体;font-size:16px"><span style="font-family:宋体">，谁能说说</span></span><span style=";font-family:宋体;font-size:16px"><span style="font-family:宋体">分数</span></span><span style=";font-family:宋体;font-size:16px"><span style="font-family:宋体">的</span></span><span style=";font-family:宋体;font-size:16px"><span style="font-family:宋体">意义</span></span><span style=";font-family:宋体;font-size:16px">?这节课我们</span><span style=";font-family:宋体;font-size:16px"><span style="font-family:宋体">一起</span></span><span style=";font-family:宋体;font-size:16px"><span style="font-family:宋体">探索关于的</span></span><span style=";font-family:宋体;font-size:16px"><span style="font-family:宋体">分数与除法的</span></span><span style=";font-family:宋体;font-size:16px"><span style="font-family:宋体">知识。</span></span></p><p style="text-autospace:ideograph-numeric;line-height:24px"><strong><span style="font-family: 宋体;font-size: 19px"><span style="font-family:宋体">二、自主尝试</span></span></strong></p><p style="text-indent: 28px;line-height: 27px"><span style=";font-family:宋体;color:rgb(51,51,51);font-size:16px">1、1/3是把单位“1”平均分成（ ）份，表示这样的（ ）份。3/4又表示什么呢？</span></p><p style="text-indent: 28px;line-height: 27px"><span style="font-family:宋体;color:rgb(51,51,51);font-size:16px">2、</span><span style=";font-family:宋体;color:rgb(51,51,51);font-size:16px"><span style="font-family:宋体">什么是分数？</span></span></p><p style="text-indent:32px;line-height:23px"><span style="font-family: 宋体;font-size: 16px">3</span><span style="font-family: 宋体;font-size: 16px"><span style="font-family:宋体">、什么叫分数？</span></span></p><p style="text-indent:32px;line-height:23px"><span style="font-family: 宋体;font-size: 16px">4</span><span style="font-family: 宋体;font-size: 16px"><span style="font-family:宋体">、在直线上用点来表示下面的分数。</span></span></p><p style="text-indent:32px;line-height:23px"><span style="font-family: 宋体;font-size: 16px">1/5 &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;5/5 &nbsp;&nbsp;&nbsp;&nbsp;8/5 &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;3/5 &nbsp;&nbsp;&nbsp;&nbsp;6/5</span></p><p style="text-autospace:ideograph-numeric;line-height:24px"><strong><span style="font-family: 宋体;font-size: 19px"><span style="font-family:宋体">三、合作探究</span></span></strong></p><p style="text-indent: 28px;line-height: 27px"><span style=";font-family:宋体;color:rgb(51,51,51);font-size:16px"><span style="font-family:宋体">探究活动一：</span></span><span style=";font-family:宋体;color:rgb(51,51,51);font-size:16px">1、理解单位“1”</span></p><p style="text-indent: 28px;line-height: 150%"><span style=";font-family:宋体;line-height:150%;color:rgb(51,51,51);font-size:16px"><span style="font-family:宋体">（</span>1）自主探究，初步感知</span><span style=";font-family:宋体;line-height:150%;color:rgb(51,51,51);font-size:16px">&nbsp;&nbsp;</span><span style=";font-family:宋体;line-height:150%;color:rgb(51,51,51);font-size:16px"><span style="font-family:宋体">把一盒月饼平均分给</span>4个同学，请问每人分得的月饼是多少？为什么你们说每人分得这盒月饼的</span><img width="24" height="43" src="http://study.teacheredu.cn/proj/static/ueditor/themes/default/images/spacer.gif"/><span style=";font-family:宋体;line-height:150%;color:rgb(51,51,51);font-size:16px"><span style="font-family:宋体">，而不说分得多少个呢？</span></span></p><p style="text-indent: 28px;line-height: 150%"><span style=";font-family:宋体;line-height:150%;color:rgb(51,51,51);font-size:16px"><span style="font-family:宋体">（</span></span><span style=";font-family:宋体;line-height:150%;color:rgb(51,51,51);font-size:16px">2</span><span style=";font-family:宋体;line-height:150%;color:rgb(51,51,51);font-size:16px"><span style="font-family:宋体">）</span></span><span style=";font-family:宋体;line-height:150%;color:rgb(51,51,51);font-size:16px"><span style="font-family:宋体">动手操作，加深体验</span></span><span style=";font-family:宋体;line-height:150%;color:rgb(51,51,51);font-size:16px">&nbsp;&nbsp;</span><span style=";font-family:宋体;line-height:150%;color:rgb(51,51,51);font-size:16px"><span style="font-family:宋体">刚才我们找到了</span>4个月饼的</span><img width="15" height="37" src="http://study.teacheredu.cn/proj/static/ueditor/themes/default/images/spacer.gif"/><span style=";font-family:宋体;line-height:150%;color:rgb(51,51,51);font-size:16px"><span style="font-family:宋体">，你能找到</span>8个月饼、12个月饼的</span><img width="16" height="41" src="http://study.teacheredu.cn/proj/static/ueditor/themes/default/images/spacer.gif"/><span style=";font-family:宋体;line-height:150%;color:rgb(51,51,51);font-size:16px"><span style="font-family:宋体">吗？</span></span></p><p style="text-indent: 28px;line-height: 27px"><span style=";font-family:宋体;color:rgb(51,51,51);font-size:16px"><span style="font-family:宋体">（</span>3）分析比较，理解单位“1”</span><span style=";font-family:宋体;color:rgb(51,51,51);font-size:16px">&nbsp;&nbsp;</span><span style=";font-family:宋体;color:rgb(51,51,51);font-size:16px"><span style="font-family:宋体">刚才我们找到了</span>1个月饼的</span><img width="16" height="41" src="http://study.teacheredu.cn/proj/static/ueditor/themes/default/images/spacer.gif"/><span style=";font-family:宋体;color:rgb(51,51,51);font-size:16px"><span style="font-family:宋体">，以及</span>4个、8个、12个月饼的</span><img width="16" height="41" src="http://study.teacheredu.cn/proj/static/ueditor/themes/default/images/spacer.gif"/><span style=";font-family:宋体;color:rgb(51,51,51);font-size:16px"><span style="font-family:宋体">，今天学习的分数与以前学习的分数什么地方不同？（课件出示）</span></span></p><p style="text-indent: 28px;line-height: 27px"><span style=";font-family:宋体;color:rgb(51,51,51);font-size:16px"><span style="font-family:宋体">把它们平均分成</span>5份或6份，想一想，</span><span style=";font-family:宋体;color:rgb(51,51,51);font-size:16px"><span style="font-family:宋体">其中的</span>1份是全部小棒的几分之几？其中的2份呢？其中的3份呢？</span></p><p><strong><span style="font-family: 宋体;font-size: 19px"><span style="font-family:宋体">四、反馈点拨</span></span></strong><strong><span style="font-family: 宋体;font-size: 19px">&nbsp;&nbsp;</span></strong><span style=";font-family:宋体;font-size:16px"><span style="font-family:宋体">反馈</span>1：</span><span style=";font-family:宋体;font-size:14px">①用除法计算</span><span style=";font-family:宋体;font-size:14px">：</span></p><p style="margin-top:0;margin-bottom:0;text-indent:16px;text-autospace:ideograph-numeric;line-height:25px"><span style="font-family: 宋体;font-size: 16px"><span style="font-family:宋体">反馈</span>2：</span><span style=";font-family:宋体;font-size:16px">②用分数表示</span><span style=";font-family:宋体;font-size:16px"><span style="font-family:宋体">：</span></span></p><p style="text-indent: 16px;line-height: 27px"><span style="font-family: 宋体;font-size: 16px"><span style="font-family:宋体">点拨</span></span><span style="font-family: 宋体;font-size: 16px"><span style="font-family:宋体">：</span></span><span style=";font-family:宋体;color:rgb(51,51,51);font-size:16px"><span style="font-family:宋体">把一盒月饼平均分给</span>4个同学，请问每人分得的月饼？</span></p><p><strong><span style="font-family: 宋体;font-size: 19px"><span style="font-family:宋体">五、巩固深化</span> &nbsp;&nbsp;</span></strong></p><p style="text-indent: 32px"><span style=";font-family:宋体;color:rgb(51,51,51);font-size:16px">1、第20页课堂活动第2题。</span></p><p style="text-indent: 32px"><span style=";font-family:宋体;color:rgb(51,51,51);font-size:16px">2、练习六第1,2,3,4题。</span></p><p><strong><span style="font-family: 宋体;font-size: 19px"><span style="font-family:宋体">六、归纳总结</span></span></strong></p><p style="text-indent: 28px;line-height: 27px"><span style=";font-family:宋体;color:rgb(51,51,51);font-size:16px"><span style="font-family:宋体">对重点内容总结：从</span>“分什么”“怎么分”“分几份”“表示这样的几份”这几个问题引导学生，归纳得出：把单位“1”平均分成若干份，表示其中1份或几份的数，叫做分数。</span></p><p style="text-indent: 28px;line-height: 27px"><span style=";font-family:宋体;color:rgb(51,51,51);font-size:16px"><span style="font-family:宋体">强调：与平均分的份数和取的份数有关。平均分的份数决定分母，表示的份数决定分子。</span></span></p><p><strong><span style="font-family: 宋体;font-size: 19px"><span style="font-family:宋体">七、</span></span></strong><strong><span style="font-family: 宋体;font-size: 19px"><span style="font-family:宋体">布置作业</span></span></strong><strong><span style="font-family: 宋体;font-size: 19px">&nbsp;&nbsp;</span></strong><span style=";font-family:宋体;color:rgb(51,51,51);font-size:16px"><span style="font-family:宋体">练习六</span> &nbsp;3、4、6</span></p><p style="background: rgb(255, 255, 255)"><strong><span style="font-family: 宋体;font-size: 19px"><span style="font-family:宋体">板书设计：</span></span></strong></p><p style="text-indent: 187px;line-height: 150%;background: rgb(255, 255, 255)"><strong><span style="font-family: 宋体;line-height: 150%;font-size: 19px"><span style="font-family:宋体">分数的意义</span></span></strong></p><p style="text-indent:80px;line-height:150%"><span style=";font-family:宋体;line-height:150%;color:rgb(51,51,51);font-size:16px"><span style="font-family:宋体">分数单位</span></span><span style=";font-family:宋体;line-height:150%;font-size:16px"><span style="font-family:宋体">（</span></span><img width="103" height="43" src="http://study.teacheredu.cn/proj/static/ueditor/themes/default/images/spacer.gif"/><span style=";font-family:宋体;line-height:150%;font-size:16px"><span style="font-family:宋体">）</span></span><span style=";font-family:宋体;line-height:150%;font-size:16px">&nbsp;</span></p><p style="text-indent:80px;line-height:150%"><span style=";font-family:宋体;line-height:150%;font-size:16px"><span style="font-family:宋体">平均分</span></span><span style=";font-family:宋体;line-height:150%;font-size:16px">2</span><span style=";font-family:宋体;line-height:150%;font-size:16px"><span style="font-family:宋体">份：</span></span><span style=";font-family:宋体;line-height:150%;font-size:16px">&nbsp;</span><img width="16" height="41" src="http://study.teacheredu.cn/proj/static/ueditor/themes/default/images/spacer.gif"/><span style=";font-family:宋体;line-height:150%;font-size:16px"><span style="font-family:宋体">、</span></span><img width="16" height="41" src="http://study.teacheredu.cn/proj/static/ueditor/themes/default/images/spacer.gif"/></p><p style="text-indent:80px;line-height:150%"><span style=";font-family:宋体;line-height:150%;font-size:16px"><span style="font-family:宋体">平均分</span></span><span style=";font-family:宋体;line-height:150%;font-size:16px">5</span><span style=";font-family:宋体;line-height:150%;font-size:16px"><span style="font-family:宋体">份：</span></span><span style=";font-family:宋体;line-height:150%;font-size:16px">&nbsp;</span><img width="15" height="41" src="http://study.teacheredu.cn/proj/static/ueditor/themes/default/images/spacer.gif"/><span style=";font-family:宋体;line-height:150%;font-size:16px"><span style="font-family:宋体">、</span></span><img width="16" height="41" src="http://study.teacheredu.cn/proj/static/ueditor/themes/default/images/spacer.gif"/><span style=";font-family:宋体;line-height:150%;font-size:16px"><span style="font-family:宋体">、</span></span><img width="15" height="41" src="http://study.teacheredu.cn/proj/static/ueditor/themes/default/images/spacer.gif"/><span style=";font-family:宋体;line-height:150%;font-size:16px"><span style="font-family:宋体">、</span></span><img width="16" height="41" src="http://study.teacheredu.cn/proj/static/ueditor/themes/default/images/spacer.gif"/><span style=";font-family:宋体;line-height:150%;font-size:16px"><span style="font-family:宋体">、</span></span><img width="15" height="41" src="http://study.teacheredu.cn/proj/static/ueditor/themes/default/images/spacer.gif"/></p><p style="line-height:150%"><span style=";font-family:宋体;line-height:150%;font-size:16px"><span style="font-family:宋体">把单位</span>“1”平均分成若干份，表示其中1份或几份的数，叫做分数。</span></p><p><span style=";font-family:宋体;font-size:16px"><span style="font-family:宋体">被除数相当于分数的分子，除数相当于分母。</span></span></p><p><strong><span style="font-family: 宋体;font-size: 19px"><span style="font-family:宋体">课后反思：</span></span></strong></p><p><br/></p>