七年级英语Theworldofnumbers2.pptx

The world of NumbersCount Number(编号编号)Tell you the timeUse in MathsAn international languageHow much do you know about Numbers?Decimals 小数小数Even numbers偶数偶数Odd numbers奇数奇数Fractions分数分数A number showing degrees度数度数A percentage百分数百分数What kinds of numbers are they?2 4 6 1 3 5 1.35 0.73/4 2/5 2562 20%60%We can use them to calculate.an electronic calculatora computeran abacusCalculating machinesan electronic calculatoraddsubtractmultiply divide percentagesquare rootcalculatecalculateCalculating MachineCalculating Machinebeadswires5,7 2 4 thousandsthousands hundredshundreds tenstens onesonesan abacusan abacusA What do you know about?1 a decimal numbers2 a pair of odd numbers 3 a fraction4 zero5 add;plus6 subtract;minus7 mutiply;times 8 divide9 a number showing degrees10 a percentage11 a pair of even numbers12 equalsA +B 0C 5/8D E =F 13 45G 8 210H 90I J 0.82 K 45%L A What do you know about?1 a decimal numbers2 a pair of odd numbers 3 a fraction4 zero5 add;plus6 subtract;minus7 mutiply;times 8 divide9 a number showing degrees10 a percentage11 a pair of even numbers12 equalsA +B 0C 5/8D E =F 13 45G 8 210H 90I J 0.82 K 45%L J 0.82F 13 45C 5/8B 0A+L-I xD H 90K 45%G 8 210E=Reading(1)Write down-1.Title:_2.Headings:_ _ _Guess-The text is about the _ of numbers and the descriptions(描述描述)of three _ _.Look at the title,the headings and the pictures,and thenAncient numbersZeroCalculating machinesNumbers:Everyones languagehistorycalculating machinesRead the text again and answer the questions1234What can an electronic calculator do?It can add,subtract,multiply and divide.It can also calculate percentages and square roots.How did people in ancient times count in the same way?They nearly all _.counted in tensHow long can a computer do a calculation?In a flash.What do the beads on the wires stand for?They stand for _ _ ones,tens,hundreds,thousands.Everyone knows at least two languages-his own language and the _ language of numbers.In _ times,nearly all numbers were counted in tens.The _ first invented and _ the system of numbers today.It _ of the numbers from 1 to 9 and 0.An abacus is fast and accurate.It was one of the first _ machines.Modern electronic calculators can _,subtract,multiply and divide.Computers are very _ calculating machines.They can do calculation in a _.Answers:internationalancientIndiansdevelopedconsistscalculatingaddpowerful flash May asks T M Li,the writer,some questions about his article on numbers.His answers are not always clear.Read the article and make Lis answers clearer.Write one word in each blank.1 Every one knows it.Knows what?The Language of numbers.2 Long ago,people wrote them in many different ways.Wrote what?Numbers.3.People all count in this way.In what way?In tens.4.The Indians invented that system of numbers.Which system of numbers?The 1 to 9 system.5 The invention helped people write in big numbers.What invention?The invention of the zero.6 They are fast and accurate.What?Abacuses.7 Computers are very powerful ones.Very powerful what?Calculating machines.Homework1.听录音,跟读课文跟读课文3遍遍,家长签名,并在课文中找到以下词组词组:至少 帮助某人做某事在古代 代表;表示由组成 写下以很多种方式 一瞬间;很快2.抄写新单词3.完成课本P46的C部分.Reading(2)plus minusmultiply divide Review the words 1 plus 3 is fourCalculate1+3=45 minus 2 is three5-2=33 multiplied by 9 is 2739=279 divided by 3 is 3.9 3=3Language pointsRead the text together!1.at least 至少=not less than We should recite at least 10 English words every day.反义词:at most 至多The concert hall can hold at most 1,000 people.2.in ancient times 在古代=long long ago=once upon a timeIn ancient times,people used stones as money.ancient 反义词:modern 现代的times=age n时代 3.consist of 由组成=include=be made up of Our class consists of 25 girls and 30 boys.4.in many different ways 以很多种方式We keep fit in many different ways.5.help sb(to)do sth.=help sb.with sth.I like helping my mother do the housework.=I like helping my mother with the housework.6.stand for=represent 代表;表示PRC stands for Peoples Republic of China.8.in a flash=very quickly =in a very short time 一瞬间;很快A computer can do a calculation in a flash.7.write down 写下 请写下你的名字。Write down your name,please!电脑可以在一瞬间完成计算.1.at least 至少2.in ancient times 在古代3.consist of 由组成4.in many different ways 以很多种方式5.help sb(to)do sth.帮助某人做某事6.stand for=represent 代表;表示7.write down 写下8.in a flash=very quickly 一瞬间;很快Review the important phrases:1 ancient:many many years ago(a)2 consists of:includes(b)3 invented:made for the first time(b)4 accurate:without mistakes(a)5 percentages:amounts out of a hundred(a)C1 Find these words in the article on page 45.Read the words around them and choose the best meanings.A B1 international a grew bigger or stronger2 system b a group of things working together3 developed c count with numbers4 calculate d strong5 bottom e used by more than one country or nation6 powerful f in the lowest place C2 Find the words in Column A in the article and match them with the meanings in Column B.1 A calculating machine using wires and heads.An _2 A small machine using electronic power to do calculations.A _3 A very powerful machine for doing calculations.A_C3 What do the following descriptions refer to?Write down the correct names in the blanks.calculatorcomputerabacusNow try a quiz about numbers.Listen to the instructions on the recording,and circle the right answer.1 1 80 80 49 49 17172 2 2.66 2.66 26%26%2/62/63 3$75$75 75%75%7575o o4 41/8 1/8 0.75 0.75 33335 5 56 56 65 65 66666 69090o o 90%90%1/9 1/97 2565 3881 7 2565 3881 2566 28812566 2881 2565 2881 2565 28818 1.8%8 1.8%80%80%18%18%9$5,000 9$5,000$50,000$50,000$50,000,000$50,000,00010 30.510 30.5o o 13.513.5o o 35 35o o 1 Which one of these is an even number?2 Which one of these is a fraction?3 Which one of these is a percentage?4 Which one of these is a decimal number?5 Which one of these is an odd number?6 Which one of these is a number showing degrees?7 My phone number is 2565 2881.8 18 per cent of my classmates come to school on foot.9 This ring costs fifty thousand dollars.10 The highest temperature today was 30 point 5 degrees.GrammarCardinalnumbers基数Ordinalnumbers序数Decimals 小数Even numbers偶数Odd numbers奇数Fractions分数a number showing degrees度数percentage百分数Cardinal numbers（基数词,表总数,点钟,电话号）37,890,542thousandmillion百万 How to read 23,150,305?thirty-seven million,eight hundred and ninety thousand five hundred and forty-two365three hundred and sixty five69,743thousandsixty nine thousand,seven hundred and forty threeOrdinal numbers(表次序的数词叫序数词,由基数词变化而来)1:one-(the)first第一第一2:two-()second3:three-()third4:其余序数词由基数词后加其余序数词由基数词后加-th 变化而来。变化而来。fourth,sixth,.five-the fifth twelve-the twelftheight-the eighthnine-the ninth 几个特殊变化的序数词Competition Sep.10 September the tenthOct.1 October the firstDec.24 December the twenty-fourthTeachers DayNational DayChristmas Eve读日期和写日期有什么区别吗？读日期和写日期有什么区别吗？226 centimetres How tall is Yao?2.26 metrespoint Decimals（小数）6.14Everest 珠穆朗玛峰six point one four8,844.43mHow much is it?￥2.90How much are the crisps?1.50(two point nine yuan)(one point five dollars)Even numbers14 202 2,846 36,122Odd numbers9 15 339 3,487 42,901the numbers of years表示年份的数词表示年份的数词Hong Kong returned in China in_.1997In _the Olympic Games will be held(被举行)in Beijing.2008 8+12 9+11558930-2030610+9010-55055+6 5 plus 6 is 11.737 minus 3 is 4.Competition338 23 multiplied by 3 is 98 divided by 2 is 4.11+940-2 202015 5 Play a game:Who is the first to get 24?(Use the four cards and“”to get 24.)6 divided by 3 is2.7 multiplied by 2 is 14.10 plus 14 is 24.Who is the first to get 24?Lets do a sum!It takes the spaceship 90 minutes to go around the earth once.How many times does it go around the earth a day?Answer:16 times.次次90 minutes=1.5 hours241.5=16the Shenzhou VI1.1103房房-Room 11032.初一初一9班班-Class 9,Junior 1 3.时间：时间：6：50-six fifty;ten to seven4.温度：温度：36C-thirty-six degree Celsius5.1/3-one third,3/5-three fifths6.15-fifteen percent7.October 10-October the tenth Thank you!