沈阳牛津英语8Bchapter4 numbers everyone's language.ppt

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1、RomanancientnumbersofRomeGreekancientnumbersofGreeceEgyptianancientnumbersofEgyptChineseancientnumbersofChinaOxfordEnglish8AChapter4Numbers:Everyone’slanguage+–=0.7928%¾36.5°Namethepictures,signsandnumbersdecimalprotractorsubtract;minusfractionmult

2、iplyplus，andcompassesis;equalpercentagedividedegree2()3=58()5=33()7=2118()6=3is/equals+dividedbymultipliedbyminusplus–Readthesums4+7=113+5–2=66×3÷9=215÷5×2=66×7÷3+1–5=10instructionsstatements▲2+6=▲2plus6equals…▲6-2=▲6minus2equals…▲2multipliedby6equ

3、als…▲6dividedby2equals…▲2×6=▲6÷2=Phrasesonpage481.inourdailylife2.aninternationallanguage3.match…with…4.adecimalnumber5.apairofodd/evennumbers6.subtract…from…7.dividedby…8.multipliedby…9.longago10.espaciallyimportant11.measureangles1.在我们日常生活中2.一个国际性的

4、语言3.把…和…匹配起来4.一个小数5.一对奇数/偶数6.从…减掉…7.除以…8.乘以…9.很久以前10.尤其重要11.测量角度Pre-readingListenandReadthepassageonpage49andtrytofindtheanswerstothesequestions1.Whatdidpeoplewriteinmanydifferentways?2.Inwhatwaydidpeoplecount?3.Whoinventedthezero?4.Whywasthezeroaver

5、yimportantinvention?Peoplewrotenumbersinmanydifferentways.Peoplecountedintens.TheIndiansinventedthezero.Becauseitmadeiteasiertowritebignumbersandtocalculate.5.Whichwasoneofthefirstcalculatingmachines?6.Whydopeoplestilluseabacusestoday?7.Whatcanamoder

6、nelectroniccalculatordo?Oneofthefirstcalculatingmachineswasanabacus.Becausetheyarefastandaccurate.Itcanadd,subtract,multiplyanddivide.Itcanalsocalculatepercentagesandsquareroots.8.Whydowesaycomputersareverypowerful?9.HowlongdidShakuntala’sbraintaketo

7、findtheanswer?Shakuntala’sbraintookfiftysecondstofindtheanswer.Becauseitcandoacalculationthatyoucouldnotdoinyourwholelifetimeinaflash.