⦁ 大数知多少——万以上数的认识 Lesson One 第一课 The surface of the "Water Cube" is covered pillow, covering an area of one hundred thousand square meters, which is the most in the world. “水立方”整体建筑的表面是由气枕覆盖而成，面积达十万平方米，堪称世界之最。 "Bird's Nest" building area of 258000 square meters, the audience seats ninety one thousand. “鸟巢” 的建筑面积为258000平方米，场内观众坐席为91000。 The area of Beijing Olympic Park is eleven million three hundred and fifty thousand square meters, including six million eight hundred thousand square meters of forest park and four million fifty thousand square meters of Olympic center area. 北京奥林匹克公园的面积为11350000平方米，包括6800000平方米的森林公园和4050000平方米的奥运中心区等。 China National Grand Theater covers an area of one hundred and eighteen thousand nine hundred square meters, with a total investment of two hundred and sixty eight million eight hundred thousand yuan. 中国国家大剧院占地总面积为118900平方米，总投资额达268800000元。 What questions can you ask? 你能提出什么问题? Cooperative exploration 合作探索 How much is one hundred thousand? 十万是多少? one thousand boxes , ten thousand boxes 一小盒1000个一大盒10000个 Ten big boxes are one hundred thousand staples. 10大盒就是十万个订书钉。 The Great Hall of the People can accommodate ten thousand people, and ten such halls can accommodate one hundred thousand people. 人民大会堂能容纳一万人，10个这样的大会堂就能容纳十万人。 My small bookcase can put hundred books ,10 such bookcases can put one thousand. What about hundred? How about one thousand? 我家的小书橱可放100本书，10个这样的书橱能放1000本。100个呢? 1000个呢? Let's count. 我们来数一数。 Eleven thousand: 一万一万地数: Ten million、twenty million、 thirty million 1万、2万、3万..... Ten, ten one hundred thousand. 10个一万是十万。 How big is one hundred million? 一亿有多大? I keep counting... 我接着数下去...... Ten hundred thousand is one million, ten one million is ten million, ten ten ten million is one million. 10个十万是一百万，10个一百万是一千万，10个一千万是一亿。 What is dial nine hundred and ninety nine thousand nine hundred and ninety nine on the counter plus one? 在计数器上拨999999再加上1是多少? nine million nine hundred and ninety nine thousand nine hundred and ninety nine plus nine plus one is 100000000 nine million nine hundred and ninety nine thousand nine hundred and ninety nine再nine加上one是 one hundred million Can you tell me how big hundred million is? 你能结合实例说说一亿有多大吗? In general, adults have about one hundred thousand hair and one thousand normal adults have about hundred million hair. 一般情况下，成年人的头发约有10万根，1000个正常成年人的头发大约有一亿根。 The second hand on the clock beats hundred million times takes more than three years. 钟表上的秒针跳动一亿下需要用3年多时间。 One, ten, a hundred, a thousand, ten thousand, one hundred thousand, one million,... are counting units. 一(个)、十、百、千、万、十万、百万千万、.....都是计数单位。 Complete the following digital order table, what can you find? 完成下面的数位顺序表，你能发现什么? According to our counting habits, from the right, every 4 digits are first class. 按照我国的计数习惯，从右边起，每4个数位是一级。 The advance rate between each adjacent two counting units is ten, which is called decimal counting. 每相邻两个计数单位间的进率都是10，这种计数方法叫作十进制计数法。 How do you read the number on the horizontal line? 横线上的数怎么读呢? First grade the number and then read from the highest level. 先把数分级再从最高一级读起。 The number of each level is read according to the method of reading within ten thousand, which level is behind... 每级的数都按万以内数的读法去读，读到哪一级就在后面..... two hundred and fifty eight thousand Read :258,000 258000 读作:二十五万八千 ninety one thousand Read :91,000 91000 读作:九万一千 eleven million three hundred and fifty thousand Read :11.35 million 11350000 读作:一千一百三十五万 six million eight hundred thousand Read :6.8 million 6800000 读作:六百八十万 four million fifty thousand 4.05 million 4050000 读作:四百零五万 one hundred and eighteen thousand nine hundred Reading :118,900 118900 读作:十一万八千九百 two billion six hundred and eighty eight million Read :2.688 billion 2688000000 读作:二十六亿八千八百万 How to read one hundred million eight thousand seventy、one hundred and forty million nine thousand eight? 100008070、140009008怎么读呢? What should we pay attention to when reading the number of 0 in the middle and at the end? 读中间和末尾有0的数要注意什么? Lesson two 第二课 The diameter of the sun is one point three nine two km, its volume is one point three million times that of the earth, and the distance from the earth is one hundred and forty nine million five hundred and ninety seven thousand eight hundred and seventy km. 太阳的直径为一百三十九万二千千米，它的体积是地球的一百三十万倍，与地球的距离是一亿四千九百五十九万七千八百七十千米。 Of the eight planets in the solar system, Venus is one hundred and eight point four five million kilometers from the sun and Jupiter is seventy eight point seven five million kilometers from the sun. 太阳系八大行星中，金星距太阳一亿零八百四十五万千米，木星距太阳七亿八千零七十五万千米。 What questions can you ask? 你能提出什么问题? Cooperative exploration 合作探索 How to write the number on the horizontal line? 横线上的数怎么写呢? Write from a high position, one level down. 从高位写起，一级一级地往下写。 under what circumstances write " zero"? 什么情况下写“0” ? one point three nine two million Writing :1392000 一百三十九万二千 写作:1392000 1.3 million Writing :1300000 一百三十万 写作:1300000 14million 599 thousand seven Writing :149597870 一亿四千九百五十九万七千八百七十 写作: 149597870 108.45 million Writing :108.45 million 一亿零八百四十五万 写作:108450000 78.075 million Writing :780.750000 七亿八千零七十五万 写作:780750000 The way to write more than ten thousand numbers is... 写万以上的数的方法是..... Lesson three 第三课 The total area of the earth is about five hundred million square kilometers, of which the land area is one hundred and forty nine million square kilometers. 地球的总面积大约是500000000平方千米，其中陆地面积是149000000平方千米。 The following table shows the land area of China, Russia and the United States. 下表是中国、俄罗斯和美国三个国家的陆地面积。 National land area (km2) 国家陆地面积(平方千米) China nine million six hundred thousand 中国9600000 Russia seventeen million seventy thousand 俄罗斯17070000 USA nine million three hundred and seventy three thousand 美国9373000 What questions can you ask? 你能提出什么问题? Cooperative exploration 合作探索 Which country has the largest land area? Which country has the smallest land area? 哪个国家的陆地面积最大?哪个国家的陆地面积最小? Compare the size of several numbers, you can first look at the number of digits. 比较几个数的大小，可以先看位数的多少..... ninety six million and nine million three hundred and seventy three thousand of the same number of digits, and then compared... 96000000与9373000的位数相同，再比较..... Of the three numbers nine million six hundred thousand,seventeen million seventy thousand,nine million three hundred and seventy three thousand,seventeen million seventy thousand has the largest number of digits, so Russia has the largest land area. 在9600000、17070000、 9373000这三个数中，17070000的位数最多，所以俄罗斯的陆地面积最大。 How to use "ten thousand" as the unit to express the land area of our country? 怎样用“万”作单位表示我国的陆地面积? ninety-six million square kilometers =nine point six million square kilometers 9600000平方千米=960万平方千米 This is convenient to write! 这样写真方便! Can you use "chemical" as a unit to represent the total area of the earth? 你能用“化”作单位表示地球的总面积吗? five hundred million square kilometers =100 million square kilometers 500000000平方千米= 亿平方千米 Lesson four 第四课 The Great Pyramid of Khufu, Egypt, is made of about two point three million blocks of stone, the largest pyramid in the world, covering an area of about fifty two thousand nine hundred square meters. 埃及胡夫大金字塔由约230万块石块砌成，是世界上最大的金字塔，占地约52900平方米。 The Mariana Trench in the Pacific Ocean is the deepest trench in the world, with a depth of about eleven thousand thirty meters, and the Pacific Ocean, with a total area of about one hundred and seventy eight million six hundred and eighty thousand square kilometers, is the largest ocean in the world. 太平洋中的马里亚纳海沟是世界上最深的海沟，深度约11030米;太平洋总面积约178680000平方千米，是世界上最大的洋。 What questions can you ask? 你能提出什么问题? Cooperative exploration 合作探索 What are the characteristics of the above groups? 上面的几组数有什么特点? "About two point three million blocks" means nearly two point three million blocks of stone ;" About fifty two thousand nine hundred square meters “约230万块”，意思是石块数接近230万块;“约52900平方米”.... These numbers are preceded by a word "approximate ", they are not exact numbers, but close to exact numbers, they are approximate numbers. 这些数的前面都有一个“约”字，它们不是精确数，但与精确数接近，它们是近似数。 Can you find approximate numbers from daily life? 你能从日常生活中找到近似数吗? There are about one thousand students in our school. 我们学校大约有学生1000人。 My family is about... 我家离学校大约.... The number of things in life, sometimes do not need to be expressed exact numbers, which is more convenient. 生活中一些事物的数量，有时不需要用精确数表示，用近似数表示更方便。 eleven thousand thirty is about tens of thousands? one hundred and seventy eight million six hundred and eighty thousand is about hundreds of millions? 11030大约是几万?178680000大约是几亿? eleven thousand thirty is more than ten thousand, much less than twenty thousand, and eleven thousand thirty is close to ten thousand. 11030比1万多一些，比2万少得多，11030接近1万。 eleven thousand thirty approximate 10000 11030≈10000 Less than five, give it up with the number on its right, and rewrite it to zero. 小于5，把它和它右面的数舍去，全改写成0。 eleven thousand thirty approximate ten thousand 11030≈1万 More than one hundred and seventy eight million six hundred and eighty thousand than 100 million, less than 200 million, close to 200 million. 178680000比1亿多得多，比2亿少一些，接近2亿。 one hundred and seventy eight million six hundred and eighty thousand approximate two hundred million 178680000≈200000000 More than five, enter one to its previous position, and then give it up with the number on its right, all rewritten to zero. 大于5，向它的前一位进1,再把它和它右面的数舍去，全改写成0。 one hundred and seventy eight million six hundred and eighty thousand approximate two hundred billion 178680000≈2亿 The method of finding approximate numbers like above is "rounding ". 像上面这样求近似数的方法是“四舍五入法”。 Can you omit the Mantissa after ten thousand bits to find the approximate numbers of two hundred and thirty four thousand one hundred and eight and one hundred and ninety five thousand eight hundred and twenty? 你能省略万位后面的尾数求出234108和195820的近似数吗? Think about how to use the rounding method to find an approximate lattice of numbers, 想一想， 怎样用“四舍五入法” 求一个数的近似格， Related links 相关链接 Our city held a "science and technology small invention" competition ,25 schools 1800 students signed up to participate. 我市举行“科技小发明”比赛，有25所学校1800名同字报名参加。 How to give each student a entry number? 怎样给每个学生船一个参赛号码呢? There are many places in life that use coding. 生活中有许多地方用到了编码。 How many parts does the ID number consist of? 身份证号码由几部分组成? I know that in 19701114 he was born... 我知道19701114表示他出生的年月...... The postcode is composed of six digits: the first two digits represent provinces (autonomous regions, municipalities directly under the Central Government), followed by separate tables... 邮政编码由六位数字组成:前两位数字表示省(自治区、直辖市)，后面的分别表..... These phone numbers are coded regularly. 这些电话号码编码都有规律。 Qingdao Admissions Examination Office (0532)85786229 青岛市招生考试办公室自考处(0532) 85786229 Qingdao Talent Service Center (0532)88916695 青岛市人才服务中心(0532) 88916695 Jinan Patent Information Service Center (0531)66608861 济南市专利信息服务中心(0531) 66608861 Booking Office (0531)95105105 济南西火车站订票处(0531 ) 95105105 Beijing Capital International Airport Metro Airport Line Customer Service (010)68345678 北京首都国际机场地铁机场线客服(010) 68345678 Beijing Daxing International Airport Bus Service (010)81698565 北京大兴国际机场巴士客服(010) 81698565 Numbers can be used not only to represent quantity and order, but also to encode. 数不仅可以用来表示数量和顺序，还可以用来编码。 Can you make up the number? 你会编参赛号码了吗? When making up the number, use the number to express the school, grade, class, etc. 编参赛号码时，要用数字把学校、年级、班级等表示出来。 Digital coding is so convenient! 数字编码真方便! |
Powered by Discuz! X3.4
Copyright © 2001-2020, Tencent Cloud.
