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1、,Numbers: everyones language,Can you read the numbers out ?,1. 82102. 0.343. 50%4. 900C5. 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.
2、Add one and one , we get two.,More practice3+5=84+2=68+9=17,8-4=4,a. Eight minus four equals four.,b. Subtract four from eight ,we get four.,More practice5-3=210-9=121-9=12,23=6,a. Two multiplied by three equals six.,b. Multiply two by three , we get six.,More practice53 =152 9 =184 6=24,82=4,a. Eig
3、ht divided by two equals four.,b. Divide eight by two , we get four .,10 5=29 3=324 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 an
4、d eight, we get twenty-four),Numbers: everyones language,Numbers:,45 4.5 45% 4/5 450,5.8 5/8 58 0.58 58%,0.03 1.0 100 0 00C,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,Egypt
5、ian 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
6、 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,sub
7、tract,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
8、so powerful, but it could only serve people, it will never take the place of human brain .,Fun for numbers,Do some interesting sums11x11=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
9、。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,7,-,15,15,4,2,25,5,-,-,-,-,-,G,o,o,d,b,y,e,Thank you !,