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单击此处编辑母版标题样式,单击此处编辑母版文本样式,第二级,第三级,第四级,第五级,*,单击此处编辑母版标题样式,单击此处编辑母版文本样式,第二级,第三级,第四级,第五级,*,单击此处编辑母版标题样式,单击此处编辑母版文本样式,第二级,第三级,第四级,第五级,*,单击此处编辑母版标题样式,单击此处编辑母版文本样式,第二级,第三级,第四级,第五级,*,单击此处编辑母版标题样式,单击此处编辑母版文本样式,第二级,第三级,第四级,第五级,*,单击此处编辑母版文本样式,第二级,第三级,第四级,第五级,*,单击此处编辑母版标题样式,单击此处编辑母版标题样式,单击此处编辑母版文本样式,第二级,第三级,第四级,第五级,*,Numbers,:,everyones,language,Can you read the numbers out?,1.8210,2.0.34,3.50%,4.90,0,C,5.,6.1,3,5,7,9.,7.2,4,6,8,10.,8.0,a decimal number,a percentage,a degree,a fraction,odd numbers,even numbers,zero,calculations,add plus,subtract,minus,multiply,divide,equal,1+1=2,a.One,plus,one equals two.,b.,Add,one,and,one,we get two,.,More practice,3+5=8,4+2=6,8+9=17,8-4=4,a.Eight,minus,four equals four.,b.,Subtract,four,from,eight,we get,four.,More practice,5-3=2,10-9=1,21-9=12,2,3=6,a.Two,multiplied by,three equals six.,b.,Multiply,two,by,three,we get six.,More practice,5,3,=15,2,9,=18,4,6=24,8,2=4,a.Eight,divided by,two equals four.,b.,Divide,eight,by,two,we get four.,10,5=2,9,3=3,24,6=4,More practice,Two multiplied by eight equals sixteen.,(Multiply two by eight,we get sixteen).,Five plus three equals eight.,(Add five and three,we get eight.),Sixteen plus eight equals,twenty-four.,(Add sixteen and eight,we get twenty-four),Numbers,:,everyones,language,Numbers:,45 4.5 45%4/5 45,0,5.8 5/8 58 0.58 58%,0.03 1.0 100 0 0,0,C,205 321 485 555 627,0.82 82%8.2 0.082 82,9-3=3,2X4=8,Arabic numbers,Ancient numbers:number 6,Greek,Roman,Egyptian,Chinese,Greece,Rome,Egypt,China,Roman numbers,A,幻灯片,15,Egyptian Numbers,3244,21237,II,Zero,Who invented zero?,Why was it a very important invention?,The Indians,.,Because it made it easier to write big numbers and to calculate,.,Calculating Machines,an abacus,an electronic machine,a computer,Calculating Machines,one of the,f_calculating,machines,A _ and f _,The beads on the wires r _ from the bottom wire.,an abacus,beads,ones,tens,hundreds,thousands,irst,ccurate,ast,epresent,7,9,5,2,wires,Calculating Machines,an electronic calculator,A:What can an electronic calculator do?,B:It can _,_,_ and _.,A:What else can it do?,B:It can calculate _ and _.,add,subtract,multiply,divide,percentages,square roots,Calculating Machines,a computer,A computer is a p_,calculating machine.In a f_,it can do a c_ that you,cannot do in your w_ life.,owerful,lash,alculation,hole,Brain,agaist,computer,Which is more powerful,a brain or a computer?,Conclusion:,Computer is so powerful,but it could only serve people,it will never take the place of human brain,.,Fun for numbers,Do some interesting sums,11x11=,111x111=,1111x1111=,11111111x11111111=,121,12321,1234321,123456787654321,Fun for numbers,Chinese poems with numbers,一,去,二三,里，烟村,四五,家。楼台,六七,座，八九,十,枝花。,一,别之后，,二,地相思。只说是,三四,月，又谁知,五六,年。,七,弦琴无心弹，,八,行书不可传，,九,连环从中折断，,十,里长亭望眼穿。,numbers in our life,:,Useful telephone number,110,120,119,114,12121,.,police,ambulance,fire engine,telephone,weather,numbers in our life,:,Number language,081376,596886,Dont be angry any more,I m leaving,bye-bye!,Assignment,1.Do some more reading:How did zero come to this world?,2.Retell the text,15,15,25,Thank you!,
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