牛津译林版八年级上Unit 2 School life More Practice Counting Before Numbers 课件(共19张PPT).pptx

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1、Unit2 NumbersMore PracticeWhat do these pictures refer to?Step 1：warming-upnumbers abacusIf there are no written numbers,how can we count things?tokens made from clay or small stonesStep 2：brainstormingfingers and toes代币代币marks on sticks and bonesCan you guess the order of their occurring time?token

2、s made from clay or small stonesStep 3:predictingfingers and toesmarks on sticks and bonesThis article mainly talks about the _ of counting methods.difference developmentdesignStep 4：skimmingScan the article and then complete the flow chart about the development of counting methods.their fingers and

3、 even their toestheir fingers and even their toessmall marks on sticks and bonessmall marks on sticks and bonestokens made from clay or small stonestokens made from clay or small stonessystems of written markssystems of written marksthe the HinduArabic HinduArabic systemsystemStep 5：scanningthe orde

4、r of their occurring timetokens made from clay or small stonesfingers and toesmarks on sticks and bonesStep 5：scanningStep 6：Intensive readingcould countAt firstsmall numbersusedfingers and toesAt first,people used their fingers,and even their toes.However they could only count small numbers in this

5、 way.Step 6：Intensive readingAfter that,they began to make small marks on sticks and bones.This helped them count bigger numbers.They used them to count things like the days of the month,the amount of food and the number of animals they had.After thatbegan to makemarks on sticks and boneshelpedcount

6、bigger numberslikethe days of the monththe amount of foodthe number of animalsStep 6：Intensive readingThen people began to use tokens made from clay or small stones.This helped them count even bigger numbers.They often put the tokens on pieces of string so that they could carry them around easily.Th

7、is developed into tools like the abacus.Then began to useto counteven bigger numbersputondeveloped intotokens made from clay or small stonestoolsStep 6：Intensive readingFinally,people began to develop systems of written marks to show different numbers,and this led to the Hindu-Arabic system(0-9).We

8、are still using this system today.Finally began todevelopto showdifferent numbersled tosystems of written marksHindu-Arabic system Step 6：Intensive readingUsing Using their fingers and even their toestheir fingers and even their toesMaking small marks on sticks and bonesMaking small marks on sticks

9、and bonesUsing tokens made from clay or small stonesUsing tokens made from clay or small stonesWhat does this refer to?Step 6：Intensive readingPutting the tokens on pieces of stringPutting the tokens on pieces of stringDeveloping Developing systems of written markssystems of written marksThe The Hin

10、du-Arabic systemHindu-Arabic systemWhat does this refer to?This often refers to something mentioned before.Things people usedWhat to countExamplesfingers and toes(small)marks on sticks and bonestokens made from clay or small stonessystems of written marksthe days of the monththe amount of foodthe nu

11、mber of animalsthe Hindu-Arabic system(0-9)the abacusdevelopmentmore and more advancedStep 7：RetellAt first,Then,After that,Finally,Step 8：Further-thinkingdifferent numbersfor exampleStep 9：Creative story-makingChoose some of the pictures below and then try to make a short story.Step 9：Creative stor

12、y-makinga 10-year-old boy135 cm tallOn October 21,2019his ninth birthdayunforgettablegot up at 7:00 in the morningcost 49.99 yuanfifty percent offwatched the football matchFrance won by 3-2saw strong smoke coming outcalled 119the fire was put outAt first,After that,Then,Finally,HomeworkThink of more

13、 occasions(场合)where we use numbers and then try to make a short story with them.Review the article we learned today and fill in the blanks._,people used their _ and even their _.However they could only count _ in this way._,they began to make _.This helped them count _.They used them to count things

14、 like the days of the month,the amount of food and the number of animals they had._ people began to use _.This helped them count _.They often put the tokens on pieces of string so that they could carry them around easily.This developed into tools like the _._,people began to develop _ to show _,and this led to the Hindu-Arabic system(0-9).We are still using this system today.Thank Thank you you for for listeninglistening