1、Numbers Ancient numbersGreekEgyptian(希腊的;希腊人;希腊语)(埃及的;埃及人)Roman=1 =5 =10 L=50 C=100 D=500 M=1000 III=3，=4，=6，=19，=20，L=MCMC=198045Chinese壹 贰 叁 肆 伍 陆 柒 捌 玖 拾 佰 仟 万Who invented these numbers?1 2 3 4 5 6 7 8 9 Who invented “zero”?Why was it a very important invention?Indian Arabian numberIt made it eas
2、ier to write big numbers and to calculate.30%a percentagen.百分数,百分比60oa number showing degreesn.度数,度,a protractora pair of compasses 56square root平方根What are these?a decimal numberadj.小数的,n.小数0.824a pair of odd numberadj.奇数的,单数的,不成对的,51 89a fraction n.分数56a pair of even numberadj.偶数的32 158+add;plus-s
3、ubtract,minusxmultiply,times divide=equalsCalculating machinesan abacusbeadone of the first calculating machinesfast and accurateused todayelectronic calculatora modern calculating machinecan add,subtract,multiply and dividecan calculate percentages and square rootsWhy do you often use it?computera
4、very powerful calculating machinecan do a calculation that you could not do in your whole lifetimebrainliving computerWhich is more powerful?Shakuntala Devi7 686 369 774 870 2 465 099 745 779=?18 947 668 177 995 426 462 773 73028 secondsHow long did it take her to work out this problem?an Indian lad
5、y916748676920039158098660927585380162483106680144308622407126516427934657040867096593279205767480806790022783016354924852380335745316935111903596577547340075681688305620821016129132845546805780158806771How long did it take to solve this problem?a =23a =?Shakuntala Devi:secondsComputer:seconds546,372
6、,8915060like lightingin a flash1.Say something about numbers.2.The development of calculating machines.+add;plus-18+26=44subtract,minus87-24=63=equalsA:Add 18 and 26B:18 plus 26 is/equals 44A:Subtract 24 from 87B:87 minus 24 is/equals 6360+34=9435 20=15xmultiply,times40 x 5=200 divide90 30=3A:Multip
7、ly 40 by 5 B:40 multiplied by 5 is 200A:Divide 90 by 30.B:90 divided by 30 equals 320 x 5=10080 16=5B1What is it?A:Think of a number.But dont tell me what it is.Add 1.Multiply the answer by 2.Now add 3.Now multiply by 2 again.Now subtract 10.Now tell me the answer.B:A:Work in pair48122abciiiiii 4589
8、3 16 7Read these numbers1 mile=1.609 kmone point six o nine40%of our classmates are girls.56of the students get to school on foot.forty percentfive sixthsHis telephone number is 86765434.I was born on January 18,1967.The Changjiang River is 6,378 kilometers long.32,805,041 thirty-two million eighty
9、hundred and five thousand and forty-one1,306,313,812 one billion three hundred and six million three hundred and thirteen thousand eight hundred and twelveSay these cardinal numbers1950one thousand nine hundred and fiftyone nine five zeronineteen fifty1.72+27 2.105-22 3.10,000 x 36 4.1,440 12 5.0.92
10、 x 18.18 6.0.504 0.12_1.72+272 2.150-22 3.10,000 x 3.6 4.1,440 120 5.0.92 x 18.16 6.0.504 1.12Work in pairFellow students Mr Tang has given our school a gift of￥35,000.Our group thinks we should buy these three things.First _.This will cost about￥_ Second,_.This will cost about￥_.Third,_ This will c
11、ost about￥_.Have you got any questions?We should buy new equipment for gym5,000We would like to buy some more books for the library.10,000We should buy some computers 20,000a traffic accident3,7483,6443,7293,639The graph shows that there _ in 1996 in our city.In _,the number _ to _ and _ to _ in _.I
12、n _ the number _again to _.It _to _in _ were 3,691 traffic accidents1997rose3,748fell3,64419981999rose3,729fell3,6392,000Traffic accidents 1996-2000riserosefallfellFahrenheit 华伦海特 Anders Celsius 摄尔西乌斯 25 C twenty-five degrees Celsiuso77 F seventy-seven degrees Fahrenheito1818世纪初德国仪器制造家世纪初德国仪器制造家华伦海特
13、华伦海特发明了一发明了一个玻璃水银柱温度计，柱上刻有度数，当水个玻璃水银柱温度计，柱上刻有度数，当水银因热而膨胀时，可以读出柱高的增加数。银因热而膨胀时，可以读出柱高的增加数。华伦海特用冰与食盐的混合物所能得出的最华伦海特用冰与食盐的混合物所能得出的最低温度作为他的刻度的零度。按他的刻度，低温度作为他的刻度的零度。按他的刻度，水的水的结冰读数为水的水的结冰读数为3232，水的沸腾读数为，水的沸腾读数为212212，两者距离为，两者距离为180180。这种刻度很快得。这种刻度很快得到普遍应用，特别是在气象工作方面，因其到普遍应用，特别是在气象工作方面，因其刻度细，有利于气象测量。刻度细，有利于气
14、象测量。17301730年法国博物年法国博物学家列奥米尔建议把结冰与沸腾之间的距离学家列奥米尔建议把结冰与沸腾之间的距离分成分成8080，这就是列氏温标。不久以后瑞典，这就是列氏温标。不久以后瑞典天文学家天文学家摄尔西乌斯摄尔西乌斯提议把两者中间的距离提议把两者中间的距离分成分成100100。1818世纪末法国国民公会采用摄世纪末法国国民公会采用摄氏刻度作为公制的一部分，现在大多数氏刻度作为公制的一部分，现在大多数国家国家都使用这种刻度的温度计。都使用这种刻度的温度计。30o60o90othirty degreessixty degreesninety degrees1.Wilbur and
15、Orville Wright,Wilbur was born on April 16,1867 and Orville was born on August 19,1871.2.Our school was built in 1987.3.Changjiang River,6,378 km4.The Himalayas in Tibet,China.Mount Qomolangma 8,844.43 meters high.5.1991,about three years.6.1,306,000,000.550,000,0007.400,000 m2 140,000 m2 (square meters)8.1,462 km(by train)/1,300 km 15 hours by train.One and a half hours by plane.9.5 oC in winter,26 oC in summer
