北师大版六年级下册数学ppt课件《比例尺》.ppt
,比例尺(建议两课时完成),第二单元 比例,六年级下册,课后作业,探索新知,(1)比例尺的意义及分类(2)比例尺的应用,课堂小结,当堂检测,北师大版六年级数学下册,北师大版六年级数学下册,第1课时 比例尺,探究点1 比例尺的意义及分类,根据信息画一画。,不合理,合理,北师大版六年级数学下册,在学校的东北方向400m处,有一个社区活动中心。先算一算,再在笑笑的图中标出来。,400m40000cm,40000100004(cm),社区活动中心,400,北师大版六年级数学下册,你能说说图中线段比例尺表示什么意思?,图上1cm表示实际距离90km。,90km9000000cm,数字比例尺1:9000000,北师大版六年级数学下册,小试牛刀(源于典中点),1填空。(1)一幅图的( )和( )的比,叫作这幅图的比例尺。(2)一幅地图上用2 cm的图上距离代表实际距离10 km。这幅地图的比例尺是()。(3)在比例尺是120000的图上,图上1 cm表示实际距离()m,图上距离是实际距离的 ,实际距离是图上距离的( )倍。(4)比例尺是1001的平面图上,表示()是()的100倍。,图上距离,实际距离,1500000,200,120000,20000,图上距离,实际距离,北师大版六年级数学下册,2在一幅地图上,量得甲、乙两地之间的图上距离是10 cm,而甲、乙两地之间的实际距离是200 km,这幅地图的比例尺是多少?,10 cm200 km10 cm20000000 cm12000000答:这幅地图的比例尺是12000000。,北师大版六年级数学下册,3小明家正北方向600 m是少年宫,少年宫正东方向400 m是医院,医院正南方向500 m是电影院,根据下图所标比例尺,接着画出上述地点的平面图。,电影院, 医院,北师大版六年级数学下册,4填空。 这是()比例尺,它表示图上1 cm相当于实际的( )km,把它改写成数值比例尺是()。5在一幅地图上,量得学校与体育馆之间的距离是 4 cm。这两地之间的实际距离是1200 m。将这幅地图的比例尺用线段比例尺表示出来。,线段,30,13000000,1200 m120000 cm120000430000(cm)300 m,0 300m,北师大版六年级数学下册,归纳总结:,(讲解源于点拨),图上距离和实际距离的比,叫作这幅图的比例尺。比例尺的形式:数值比例尺和线段比例尺。线段比例尺的特点是能更直观地表示图上1 cm 相当于实际若干米(或千米等)。,北师大版六年级数学下册,小试牛刀(教材P22练一练),学校一幢教学楼长42m,宽9m。在纸上画出教学楼的示意图,并和同伴交流你是如何画的。,略。,北师大版六年级数学下册,说说下面两幅图的比例尺的实际意义。,比例尺 1:9000000,图上1cm表示实际距离9000000cm,也就是90km。,北师大版六年级数学下册,说说下面两幅图的比例尺的实际意义。,图上1cm表示实际距离50m。,北师大版六年级数学下册,北京到广州的实际距离大约是1920km,在一幅地图上量 得这两地间的距离是20cm。这幅地图的比例尺是多少?,1920km192000000cm,20:1920000001:9600000,北师大版六年级数学下册,易错辨析(选题源于典中点),6一个电脑零件长6 mm,在设计图纸上量得它的长是2.4 dm,这幅图纸的比例尺是多少?,2.4 dm6 mm240 mm6 mm401答:这幅图纸的比例尺是401。,易错点:计算比例尺时应用图上距离除以实际距离。,北师大版六年级数学下册,第2课时 比例尺,探究点2 比例尺的应用,下图为我国地图的一部分。,图上1cm表示34000000cm,也就是1cm表示340千米。,奇思从这幅地图上量得北京到上海的距离大约是3cm。两地之间的实际距离约是多少千米?,1,2,34031020(km),解:设实际距离为x厘米。,3:x1:34000000,x334000000,x102000000,102000000厘米1020千米,答:两地之间的实际距离 约是1020千米。,图上1cm表示34000000cm,也就是1cm表示340千米。,妙想要从青岛去石家庄,量一量图上距离,算一算算青岛到石家庄的实际距离大约是多少千米。,3401.7578(km),答:青岛到石家庄的实际距离大约是578千米。,量得青岛到石家庄的距离大约是1.7cm。,小试牛刀(源于典中点),1笑笑在比例尺是13000000的地图上,量得北京与某地之间的图上距离是12 cm,北京到某地的实际距离是多少千米?解法一:图上1 cm表示()km。()12()km答:北京到某地的实际距离是()km。解法二:解:设北京到某地的实际距离是x cm。,30,30,360,360,1300000012xx3600000036000000 cm360 km答:北京到某地的实际距离是360 km。,2填表。,15000000,1.4 km,3 cm,3.一个手机零件在比例尺是1001的图纸上的长度是20 cm,这个零件的实际长度是多少毫米?,201000.2(cm)0.2 cm2 mm答:这个零件的实际长度是2 mm。,归纳总结:,(讲解源于典中点),比例尺是图上距离与实际距离的比,并不是图上面积与实际面积的比。,小试牛刀(教材P23练一练),A图纸:图上1cm表示实际距离2000cm,也就是1cm表示20m。,两张不同的图纸,A图纸的比例尺是1:2000,B图纸的比 例尺是1:500。那么,这两张图纸上3cm长的线段表示的 实际长度各是多少米?,20360(m),B图纸:图上1cm表示实际距离500cm,也就是1cm表示5m。,5315(m),5. (1)街心花园到学校的实际距离是1000m,图上距离是_cm;那么, 图上距离1cm 表示的实际距离是_cm,这个示意图的比例尺 是_。 (2)街心花园到健身中心的图上距离是_cm;实际距离是_m。 (3)电影院在街心花园西偏南30方向,实际距离为500m的地方,请 在图中标出电影院的位置。 (4)根据示意图,请你再提出一个数学问题,并尝试解答。,4,250,1:25000,7,1750,略。,略。,量一量你家某一房间的长和宽,以及一些家具的长和宽, 然后以1:100的比例尺画出这一房间的平面图。,略。,找一张中国地图,用 标出你家乡的大致位置。,(1)估一估,在地图上你的家乡与北京的距离大约是 _ cm,实际距离大约是_ km。(如果你的 家乡是北京,找一张北京地图,估一估在北京地图 上你家与天安门的距离是_ cm,实际距离大约 是_ km。) (2)放暑假时,你打算从_到_旅游,两地之间 的实际距离大约是_ km。,略。,版权申明本文部分内容,包括文字、图片、以及设计等在网上搜集整理.版权为个人所有This article includes some parts, including text, pictures, and design. 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In addition, when any content or service of this article is used for other purposes, written permission and remuneration shall be obtained from the person concerned and the relevant obligee. 转载或引用本文内容必须是以新闻性或资料性公共免费信息为使用目地地合理、善意引用,不得对本文内容原意进行曲解、修改,并自负版权等法律责任.Reproduction or quotation of the content of this article must be reasonable and good-faith citation for the use of news or informative public free information. It shall not misinterpret or modify the original intention of the content of this article, and shall bear legal liability such as copyright.,版权申明本文部分内容,包括文字、图片、以及设计等在网上搜集整理.版权为个人所有This article includes some parts, including text, pictures, and design. Copyright is personal ownership.用户可将本文地内容或服务用于个人学习、研究或欣赏,以及其他非商业性或非盈利性用途,但同时应遵守著作权法及其他相关法律地规定,不得侵犯本网站及相关权利人地合法权利.除此以外,将本文任何内容或服务用于其他用途时,须征得本人及相关权利人地书面许可,并支付报酬.Users may use the contents or services of this article for personal study, research or appreciation, and other non-commercial or non-profit purposes, but at the same time, they shall abide by the provisions of copyright law and other relevant laws, and shall not infringe upon the legitimate rights of this website and its relevant obligees. In addition, when any content or service of this article is used for other purposes, written permission and remuneration shall be obtained from the person concerned and the relevant obligee. 转载或引用本文内容必须是以新闻性或资料性公共免费信息为使用目地地合理、善意引用,不得对本文内容原意进行曲解、修改,并自负版权等法律责任.Reproduction or quotation of the content of this article must be reasonable and good-faith citation for the use of news or informative public free information. 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In addition, when any content or service of this article is used for other purposes, written permission and remuneration shall be obtained from the person concerned and the relevant obligee. 转载或引用本文内容必须是以新闻性或资料性公共免费信息为使用目地地合理、善意引用,不得对本文内容原意进行曲解、修改,并自负版权等法律责任.Reproduction or quotation of the content of this article must be reasonable and good-faith citation for the use of news or informative public free information. It shall not misinterpret or modify the original intention of the content of this article, and shall bear legal liability such as copyright.,版权申明本文部分内容,包括文字、图片、以及设计等在网上搜集整理.版权为个人所有This article includes some parts, including text, pictures, and design. Copyright is personal ownership.用户可将本文地内容或服务用于个人学习、研究或欣赏,以及其他非商业性或非盈利性用途,但同时应遵守著作权法及其他相关法律地规定,不得侵犯本网站及相关权利人地合法权利.除此以外,将本文任何内容或服务用于其他用途时,须征得本人及相关权利人地书面许可,并支付报酬.Users may use the contents or services of this article for personal study, research or appreciation, and other non-commercial or non-profit purposes, but at the same time, they shall abide by the provisions of copyright law and other relevant laws, and shall not infringe upon the legitimate rights of this website and its relevant obligees. In addition, when any content or service of this article is used for other purposes, written permission and remuneration shall be obtained from the person concerned and the relevant obligee. 转载或引用本文内容必须是以新闻性或资料性公共免费信息为使用目地地合理、善意引用,不得对本文内容原意进行曲解、修改,并自负版权等法律责任.Reproduction or quotation of the content of this article must be reasonable and good-faith citation for the use of news or informative public free information. It shall not misinterpret or modify the original intention of the content of this article, and shall bear legal liability such as copyright.,版权申明本文部分内容,包括文字、图片、以及设计等在网上搜集整理.版权为个人所有This article includes some parts, including text, pictures, and design. Copyright is personal ownership.用户可将本文地内容或服务用于个人学习、研究或欣赏,以及其他非商业性或非盈利性用途,但同时应遵守著作权法及其他相关法律地规定,不得侵犯本网站及相关权利人地合法权利.除此以外,将本文任何内容或服务用于其他用途时,须征得本人及相关权利人地书面许可,并支付报酬.Users may use the contents or services of this article for personal study, research or appreciation, and other non-commercial or non-profit purposes, but at the same time, they shall abide by the provisions of copyright law and other relevant laws, and shall not infringe upon the legitimate rights of this website and its relevant obligees. In addition, when any content or service of this article is used for other purposes, written permission and remuneration shall be obtained from the person concerned and the relevant obligee. 转载或引用本文内容必须是以新闻性或资料性公共免费信息为使用目地地合理、善意引用,不得对本文内容原意进行曲解、修改,并自负版权等法律责任.Reproduction or quotation of the content of this article must be reasonable and good-faith citation for the use of news or informative public free information. It shall not misinterpret or modify the original intention of the content of this article, and shall bear legal liability such as copyright.,版权申明本文部分内容,包括文字、图片、以及设计等在网上搜集整理.版权为个人所有This article includes some parts, including text, pictures, and design. Copyright is personal ownership.用户可将本文地内容或服务用于个人学习、研究或欣赏,以及其他非商业性或非盈利性用途,但同时应遵守著作权法及其他相关法律地规定,不得侵犯本网站及相关权利人地合法权利.除此以外,将本文任何内容或服务用于其他用途时,须征得本人及相关权利人地书面许可,并支付报酬.Users may use the contents or services of this article for personal study, research or appreciation, and other non-commercial or non-profit purposes, but at the same time, they shall abide by the provisions of copyright law and other relevant laws, and shall not infringe upon the legitimate rights of this website and its relevant obligees. In addition, when any content or service of this article is used for other purposes, written permission and remuneration shall be obtained from the person concerned and the relevant obligee. 转载或引用本文内容必须是以新闻性或资料性公共免费信息为使用目地地合理、善意引用,不得对本文内容原意进行曲解、修改,并自负版权等法律责任.Reproduction or quotation of the content of this article must be reasonable and good-faith citation for the use of news or informative public free information. It shall not misinterpret or modify the original intention of the content of this article, and shall bear legal liability such as copyright.,谢谢,