人教版三年级数学认识周长说课课件图文

（三）内化巩固，运用周长
《数学课程标准》指出：“数学课程应遵循学 生学习数学的心理规律，强调从学生的已有的知 识经验出发，让学生亲身经历将实际问题抽象成 数学模型，并进行解释、应用的过程。学习数学 的重要目的，在于用数学知识去解决日常生活中 的实际问题。
With the improving quality of life as well as the ever-accelerating pace of life, the quality of people's food needs and rate also changing.In order to meet the needs of society
五、说教学过程
（一）创设情境，感受周长
心理学研究表明，学习内容和学生熟悉的生活场 景越贴近，学生自觉接纳知识的程度就越高，从而使学 生感受到数学无处不在，又能使学生产生浓厚的学习兴
趣。。
With the improving quality of life as well the quality of people's food needs and rate also changing.In order to meet the needs of society
（四）课堂小结
你学到了什么知识？ 让学生自己说说本节课的收获，既是对本 节课所学知识的回顾与整理，又可以培养学 生的概括表达和自我评价的能力。
With the improving quality of life as well as the ever-accelerating pace of life, the quality of people's food needs and rate also changing.In order to meet the needs of society
LOREM IPSUM DOLOR
• 一、说教材 • 二、说学情 • 三、说教法 • 四、说学法 • 五、说教学过程 • 六、说板书设计
With the improving quality of life as well as the ever-accelerating pace of life, the quality of people's food needs and rate also changing.In order to meet the needs of society
（四）、教学准备
教师准备：课件，铁丝，直尺。 学生准备：图片，细线，直尺。
With the improving quality of life as well as the ever-accelerating pace of life, the quality of people's food needs and rate also changing.In order to meet the needs of society
1.增加干扰，强化一周 2.拼组图形，弱化“面”的干扰
With the improving quality of life as well as the ever-accelerating pace of life, the quality of people's food needs and rate also changing.In order to meet the needs of society
六、板书设计： 认识周长
封闭图形一周的长度叫做周长
1 、 我分别出示几个不同图形，让学生画出图形边线， 感知周长。 2、小组合作测量周长 3、用同样长的绳子围成不同形状的图形，感知周长
With the improving quality of life as well as the ever-accelerating pace of life, the quality of people's food needs and rate also changing.In order to meet the needs of society
（三）教学重点难点
重点：体会周长的含义，能正确测 量具体图像的周长。 难点：建立周长的空间观念。
With the improving quality of life as well as the ever-accelerating pace of life, the quality of people's food needs and rate also changing.In order to meet the needs of society
人教版小学三年级数学上册
认识周长
With the improving quality of life as well as the ever-accelerating pace of life, the quality of people's food needs and rate also changing.In order to meet the needs of society
With the improving quality of life as well as the ever-accelerating pace of life, the quality of people's food needs and rate also changing.In order to meet the needs of society
With the improving quality of life as well as the ever-accelerating pace of life, the quality of people's food needs and rate also changing.In order to meet the needs of society
（二）、教学目标
1.通过观察、操作等活动理解和掌握周长的概念。 2.在描一描、量一量、算一算活动中进一步理解周 长的概念，了解一定的测量方法，渗透化曲为直是思 想，培养学生的空间。 3.能结合具体情境，感知周长与实际生活的密切联 系。
With the improving quality of life as well as the ever-accelerating pace of life, the quality of people's food needs and rate also changing.In order to meet the needs of society
四、说学法
1、学生的学习方法是动手实践、自主 探索、合作交流。
2、学生通过动手实践、自主探索、合 作交流等活动，掌握基本知识和技能，发 展数学思考和解决问题的能力，形成良好 的情感、态度和价值观。
With the improving quality of life as well as the ever-accelerating pace of life, the quality of people's food needs and rate also changing.In order to meet the needs of society
二、说学情
“认识周长”是“空间与图形”的重 要内容之一。因为几何初步知识,无论是线、 面、体的特征还是图形特征、性质，对于 小学生来讲，都比较抽象。学生对知识的 理解往往不是一次完成的，需要有逐步深 入、提高的过程。
With the improving quality of life as well as the ever-accelerating pace of life, the quality of people's food needs and rate also changing.In order to meet the needs of society
一、说教材
（一）教材简析
“认识周长” 是人教版小学数学 三年级上册第七单元的内容,是在学 生已经认识了长方形、正方形的基 础上进行教学的。
With the improving quality of life as well as the ever-accelerating pace of life, the quality of people's food needs and rate also changing.In order to meet the needs of society
三、说教法
为突出重点、突破难点，在教学上以情景教 学为主，采用情景式教学主要是由教材和儿童的 认知决定。 1、“问题情境——建立模型——解释、应用与 拓展、反思”的基本模式展现内容是人教版教材 编排的主要方法。 2、从儿童的认知特点看：中、低年级学生在学 习过程中更注重“有趣、好玩、新奇”事物，更 加喜欢动手去操作。
With the improving quality of life as well as the ever-accelerating pace of life, the quality of people's food needs and rate also changing.In order to meet the needs of society
（二）引导探究，计算周长
《数学课程标准》在第一学段中提出了“结合生活 实际，经历用不同的方法测量物体的长度的过程”， 还强调“引导学生在测量过程中根据现实问题，选择 合适的测量方法和工具，以及利用测量进行数学探究 活动。”荷兰学者弗赖兰塔尔指出：“学习数学最好 的方式就是‘做’中学”。动手操作、自主探索与合 作交流是学生学习的主要方式 。