Daily talk Whats the date today? How old / tall are you? Whats your study number(学号)? How much does a pen usually cost? What is the postcode of Ganxiang?Numbers: _ language Reading (II)Oxford English 8A page 57Ganxiang School Zhang LiliEveryonesWe use them to tell the time show our age/ count calculate In ancient times, there were different ways of writing numbers.Zero is an especially important number.Machines make it easier for us to calculate.Your brain may calculate better than a computerEgyptian埃及的ChineseRoman罗马的Greek希腊的6People wrote numbers _,However, they nearly all counted_ -in _. Ancient numbers In ancient times，Part Onein many different waysin the same waytens1.What numbers are there in the system ofnumbers that most of us use?3.What did they invent then?Part TwoZero 4.Why was it a very important invention?2.What did the Indians invent first?1 12 24 45 58 83 36 67 7 9 9Most of us use the system of numbers with numbers from 1 to 9 and 0 (zero). With these ten numbers, we can write any number from the biggest to the smallest. The Indians first invented and developed the 1 to 9 system of numbers. They then invented the zero. This was a very important invention because it made it easier to write big numbers and to calculate.1.What numbers are there in the system ofnumbers that most of us use?3.What did they invent 3.What did they invent thenthen? ?Part TwoZero 4.Why was it a very important invention?4.Why was it a very important invention?2.What did the Indians invent 2.What did the Indians invent firstfirst? ?1 12 24 45 58 83 36 67 7 9 9The 1 to 9 system of numbers.Because it made it easier to write big numbers and to calculate.1 12 24 45 58 83 36 67 79 9Ancient numbers Modern numbers Which numbers are easier to write?to calculate?Which numbers are easier for people in different countries to understand each other?an abacusan electronic calculatora computerPart ThreeCalculating machines abacusWhy do people use them?electronic calculatorcomputercalculating machines features 特点one of the first calculating machinesso fast and accurateadd, subtract, multiply and divide, calculate percentages and square rootspowerful calculating machines, In a flash, do a calculation that you could not do in your whole lifetimestrongin a short timewith no mistakesdo a difficult calculation in a short timea human brain156 50 =Find the number that, when it is multiplied 23 times by itself, gives this answer: 916748676920039158098660927585380162483106680144308622 4071265164279346570408670965932792057674808067900227830 1635492485238033574531693511190359657754734007568168830 5620821016129132845546805780158806771a = 23a computerBrain against computer Part Foura lady from India _ an amazing brain.withShakuntala Devi916748676920039158098660927585380162 483106680144308622407126516427934657 040867096593279205767480806790022783 016354924852380335745316935111903596 577547340075681688305620821016129132 845546805780158806771How long did it take to solve this problem?a = 23a = ?Shakuntala Devi: secondsComputer : seconds546,372,8915060Which one is a more powerful calculator, a human brain or a computer?Someone had to first _ the computer with _, and that took _. _had to programShakuntala.programinstructionsmany hoursNo oneA game: 12345678Numbers Numbers are With numbers, we can We also use them to They made it easier toIf there are no numbers, So numbers play an important part in our life. Listen and read the text on page 57 three times. Recite new words Find more information about numbers.1.An ancient calculating machine that is still used today. Whats it?An _.abacus2. Shakuntala Devi is an Indian lady _.with an amazing brain3. Who invented the 1to 9 system of numbers?_.The Indians4. In ancient times, people counted in_.(one word)tens5.A very powerful machine for doing calculations. Whats it?A _.computer6. Shakuntalas brain works very fast.It can do a calculation _.like lightning7. What can a modern electronic calculator do? _It can add, subtract, multiply and divide. It can also calculate percentages and square roots.8. Why do people still use abacuses? _They are so fast and accurate.Complete the summary.Ancient numbers In ancient times, people wrote numbers _ _, but they are nearly counted _. Zero Everyone uses the _ 1 to 9 and 0 (zero). The _ invented them. _ makes it _ to write big numbers and to calculate. Calculating machines The three calculating machines: the _, the _ and the _ make our life easier. Brain against computer There was once a competition