2022年人教版小学数学五年级下册第四单元分数的意义与性质教学案.docx

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1、精选学习资料 - - - - - - - - - amende d Decre e No. 344 2011.12.1 the State Council prom year to review the documentation issued by, not suitable ulgated by Decree No. 591, 9 Peoples Republi c of Chi docume nts be revised in a timely manner. 4.6.2 processes, technologhi na regulations on r oad transport 2

2、004.07.01 2004.01.13 10 safety production lice y, material change s on or after an accide nt, and bi otech branch anse nd that tOrdi nance, pr omulgated by Decre e No. 406 of the State Council prom ulgated by De cree of the State Council , No. 397 11 he workshop should be timely to various regulati

3、ons a nd safety rules be revi sed to e nsure suita bility and effectivene1 2007.06.01 ss. 4.6.3 revi siproduction safety acci on of the file change adent re porting pproval form shoul, investigation and ha d be filled indli ng of Or dina n, indicati ng the cance promulgated by D use s and cha nges,

4、a ppre cree No. 493, 12 of the State Council reg oved by t he De puty in charge of seulations on specia l equipment safety supervi curity, Ge neral Ma nager of revisi on. 4.6.4 a new revisesion 2009.05.01 amended Decree d safety regulations ae No. 373 State Council De nd safety rule s shoul d be rel

5、ecree No. 549, 13 i a sed t o the post in a timely nsur ra nce reg manner to ulations regardi e nsure rules ang industrial i njurie s 2011.01.01 amendment, pr nd safety regulations of each post is the latest file, reomulgated by cover tDecre e No. 586 of the State Council prom he origi nal document

6、unified voim d. 5. relateulgated by De cree No. 375, 14 admi d records 5.1 list of applica ble lawnistration of pre cursor chemicals s, regulati ons a nd sta ndar ds of theOrdi nance 2005.11.01 State Council De cree No. 445, 15 w i nvent ory listing number carbon industry laws and regulatiorkpla ces

7、 w here toxi ons legal regulati ons c substances are a nd other re used t quiremo labour pr ents came intotection 2002.05.12 the State Council o force date ena cted se ctor promulgate update recor d 1/stad by De ndare cree No. 352, 16 w omen w orkers . 4.6 review and revisi on 4.6.1 producti on te c

8、hnol d num ber Pe ople s Republic of Chi na 2, Chairman of the national peoples Congress made the 70th ogy secti on Office productiorganize d relevant on safety law 2002.11.1 Pedepartme ents units once a ople s Republic of China Law of occupational disease prevention 2002.05.01 NPC 3, order of the P

9、resident of the 60th Peopl es Republic of Chi na fire control law of 2009.05.01 4, Chairman of the national peoples Congress Standing Committee 6th Peoples Republic of China labor law 2008.1.1, Chairman of the national people s Congress Standi ng Committee, 65th 5 Peoples Republic of China on road t

10、raffic safety law 2011.5.1, Chairman of the national pe oples Congress made the 47th, 6 Pe opl es Republic of China Trade Union law 2001.10.27 7, Chairman of the national peopl es Congress made the 62nd Peoples Republic of Chi na emergency response law 2007.11.1, Chairman of the national peoples Con

11、gress, the 69th 8 Hazardous chemical safety management regulation amended Decree No. 344 2011.12.1 the State Council promulgated by Decree No. 591, 9 People s Republic of China regulations on road transport 2004.07.01 2004.01.13 10 safety production license Ordinance,小学集体学案（备课）用表教学课题 学案编写者 学案使用者编写时间

12、： xxx 年月日五年级上册第四单元：分数的意义和性质教学用课时第周星期用一、教学内容。 1分数的意义、分数与除法的关系2真分数与假分数 3分数的基本性质4最大公因数与约分5最小公倍数与通分6分数与小数的互化教课（章节）教二、教学目标。 1知道分数是怎样产生的，理解分数的意义，明确学目学分数与除法的关系。2认识真分数和假分数，知道带分数是一部分假分标目标数的另一种书写形式，能把假分数化成带分数或整数。3理解和掌握分数的基本性质，会比较分数的大小。4理解公因数与最大公因数、公倍数与最小公倍数，能找出两个数的最大公因数与最小公倍数，能比较熟练地进行约分和通分。教学重点与难点教学准备与手段理解分数的

13、基本性质。发现和归纳分数的基本性质，并能应用它解决相关 的问题。求两个数的最大公因数的方法课件1多侧面地展现了分数的来源。现实需要和数学需要。2把因数、倍数的有关知识与分数的相关知识结合起来教学。3关注数学的抽象过程，从现实问题情境引出数学问题，得出数学知识。4部分内容作了适当的精简处理或编排调整。集体备课（1）求一个数是另一个数的几分之几的实际问题，原来安排在分数与 共性意见 除法的关系之后，现在挪后。（2）分数大小比较，不单列一段，而是与 通分结合在一起学习。（3）删去了原来第 2 节中把整数或带分数化成假分数的内容。5充分利用教材资源，用好直观手段。6及时抽象，在适当的抽象水平上，建构数

14、学概念的意义。7揭示知识与方法的内在联系，在理解的基础上掌握方法。名师归纳总结 promulgated by Decre e No. 406 of the State Council promulgated by Decree of the State Council, No. 397 11 2007.06.01 production safety accident reporting, investigation and handling of Ordina nce promulgated by De cree No. 493, 12 of the State Council regulat

15、ions on special equipment safety supervision 2009.05.01 amended Decree No. 373 State Council Decree No. 549, 13 insurance regulations regarding industrial injuries 2011.01.01 amendment, promulgated by Decree No. 586 of the State Council prom m ulgated by Decree No. 375, 14 admnistration of precursor

16、 chemicals Ordinance 2005.11.01 State Council Decree No. 445, 15 workplaces where toxic substances are used to labour protection 2002.05.12 the State Council promulgated by De cree No. 352, 16 women workers . 4.6. review and revise 4.6.1 producti on technol ogy section Office once every year and org

17、a nize relevant departments to review unit on the issuing of system files, not suitable documents be revised in a timely manner. 4.6.2 processes, technology, material changes on or after an accident, and biotech branch and that the 第 1 页，共 21 页workshop should be timely to various regulati Standing C

18、ommittee 6th Pe opl es Republions and safety rules be revise d to ensure suitabil ity and effective c of Chi na labor law 2008.1.1, Chairman of the national peoples Congress Standing Commness. 4.6.3 revision of the file cha nge approval form shoul ittee, 65th 5 Peoples Republi c of Chid be fille na

19、on roa d in, i ndi cating the causes and change a d traffic safety law 2011.5.1, Chairman of the s, approved by the Deputy i n charge of security, General national pe opl es Congress made the 47th, 6 Peoples RepubliManager li of revision. 4.6.4 a new revise c of China Trade Unid safety regulations a

20、 on law 2001.10.27 7, Chairman of the e nd safety rules shoul d be relea national pe oplea sed t o the post in a timely manner to e s Congress made the 62nd Peoples Rensure rules a public of China emergend safety regulations of each post is the late ncy response la w 2007.11.1, Chairmast file, recov

21、er t n of the national pehe origi nal document unified voi ople s Congress, the 69td. 5. relate d records 5.1 list of applica ble law s, regulati h 8 Hazar dous chemical safety management regulati on ameons a nd sta nde d Decreta ndards of the invent e No. 344 2011.12.1 tory listing number he State

22、Council promcarbon industry laws and regulati ons legal regulati ulgated by Decree No. 591, 9 Peoples Rep ubons a li c of Chind other requirement s came int o force date e na regulati ons on road transport 2004.07.01 nacted se ctor update re cor d 1/standard 2004.01.13 10 safety production lice nsnu

23、mber Pe oples Re public of China e Ordi nance, pr omulgated by Decre2, Chairman of the national pe e No. 406 of the State Council promopl es Congress made the 70th pr oducti on safety law 2002.11.1 Pe oples Republi ulgated by De cree of the State Council, No. 397 11 2007.06.01 production safety acci

24、dec of China Law of occupati nt repor ng, inve onal disease preventi on 2002.05.01 NPC 3, or der of the Pre si e stigation a nd handling of Ordinance prom ulgated by Decreede nt of the 60th People s Republic of China fire control law of 2009.05.01 4, Chairman of the national peoples Congre ss - - -

25、- - - -精选学习资料 - - - - - - - - - 第一课时： 分数的意义教学过程教学环教师活动学生活动使用者再创节及反思记录一、一、分数的产生在我们的日常生活中， 为了平分教师： 我们长度可以用 “ 米”均分配一些东西， 也常常会遇到不能用整数表示的情况。比如，数作单位，但是在测量物体长度两个小朋友平分一个橘子、一块时，用“ 米” 做单位，结果往的月饼、一包饼干， 每人分到的能往不是整数，在古代，人们就用整数表示吗？产已经遇到了这样的问题（教师用一根打了结的绳子演示古人生测量的情况）。引入：正是这样的实际需要，产生了分数。这也是我们今天 要认识的一个新的概念。根据学生的回答，教师

26、逐步 总结：把一个图形看作一个整 体，平均分成 4 份，这样的一份二、二、分数的意义是，三份是。把 4 根香蕉看1以前，我们已经学过分数作一个整体， 平均分成 4 份，每分的初步认识，你能举例说明的根是这把香蕉的，三根是。数含义吗？把一盘面包看作一个整体，平均的2看课本插图，说一说，每意分成 4 份，每份是这盘面包的，个图下面的分别是：义三份是。（1）把什么看作一个整体？（2）平均分成了几份？（3）表示这样的几份？分子：表示有这样的几份 分母：表示把单位“ 1 ” 平均3如果把改成，请再说分成了几份62 页上的 “ 做说它的具体含义。1学生完成第4概括分数的意义。一做” （填写在课本上）。名师

27、归纳总结 - - - - - - -第 2 页，共 21 页精选学习资料 - - - - - - - - - amende d Decre e No. 344 2011.12.1 the State Council prom year to review the documentation issued by, not suitable ulgated by Decree No. 591, 9 Peoples Republi c of Chi docume nts be revised in a timely manner. 4.6.2 processes, technologhi na re

28、gulations on r oad transport 2004.07.01 2004.01.13 10 safety production lice y, material change s on or after an accide nt, and bi otech branch anse nd that tOrdi nance, pr omulgated by Decre e No. 406 of the State Council prom ulgated by De cree of the State Council , No. 397 11 he workshop should

29、be timely to various regulati ons a nd safety rules be revi sed to e nsure suita bility and effectivene1 2007.06.01 ss. 4.6.3 revisi siproduction safety acci on of the file change adent re porting pproval form should , investigation and ha d be filled indli ng of Or n, indicati ng the ca dina nce pr

30、omulgated by D a use s and cha nges, a ppre cree No. 493, 12 of the State Council reg oved by t he De puty in charge of seulations on specia l equipment safety supervi curity, Ge neral Ma nager of revisi on. 4.6.4 a new revisesion 2009.05.01 amended Decree d safety regulations ae No. 373 State Counc

31、il De nd safety rule s shoul d be releacree No. 549, 13 i sed t o the post in a timely nsur ra nce reg manner to e ulations regardi e nsure rules ang industrial i njurie s 2011.01.01 amendment, pr nd safety regulations of each post is the latest file, reomulgated by cover ttDecre e No. 586 of the St

32、ate Council prom he origi nal document unif ied voi m i d. 5. relate ulgated by De cree No. 375, 14 admi te d records 5.1 list of applica ble lawnistration of pre cursor chemicals s, regulati ons a nd sta ndar ds of the i Ordi nance 2005.11.01 State Council De i nvent ory listing number carbon inncr

33、ee No. 445, 15 w dustry laws and regulatiorkpla ces w here toxi ons legal regulati ons a c substances are a nd other re used t quiremo labour pr ents came intotection 200 2.05.12 the State Council promulgate o force date ena cted se ctor update recor d 1/stad by De cree No. 352, 16 w omen w orkers .

34、 4.6 review and revisi on 4.6.1 producti on te chnol ndar d num ber Pe ople s Republic of Chi na 2, Chairman of the national peoples Congress made the 70th ogy secti on Office productiorganize d relevant on safety law 2002.11.1 Pedepartme ents units once a ople s Republic of China Law of occupationa

35、l disease prevention 2002.05.01 NPC 3, order of the President of the 60th Peopl es Republic of China fire control law of 2009.05.01 4, Chairman of the national peoples Congress Standing Committee 6th Peoples Republic of China labor law 2008.1.1, Chairman of the national people s Congress Standi ng C

36、ommittee, 65th 5 Peoples Republic of China on road traffic safety law 2011.5.1, Chairman of the national pe oples Congress made the 47th, 6 Pe opl es Republic of Chi na Trade Union law 2001.10.27 7, Chairman of the national peopl es Congress made the 62nd Pe oples Republic of Chi na emergency respon

37、se law 2007.11.1, Chairman of the national peoples Congress, the 69th 8 Hazardous chemical safety management regulation amended Decree No. 344 2011.12.1 the State Council promulgated by Decree No. 591, 9 People s Republic of China regulations s on road transport 2004.07.01 2004.01.13 10 safety produ

38、ction license Ordinance,（1）一个物体或一些物体等2交流、核对答案。都可以看作一个整体，把一个习题精选整体平均分成若干份，这样的一份或几份可以用分数几分之一、判断题一或几分之几来表示。（2）一个整体可以用自然数 1 来表示，通常把它叫做单位1比较两个分数的大小，只 要比较它们的分数单位就可以，分数单位大的分数值就大分数“ 1” 。单位小的分数值就小。（）（3）请说出上面三个例子中 的单位“1” 分别指什么。（4）你能说出分子、 分母的 含义吗？同桌两人议一议。（5）以 为例，说一说分数 的书写顺序及其含义。24 吨的和 1 吨的同样重。（ ）3把 3 千克糖平均分成 4

39、 份，每份就是。（）4分母越大的分数值越小。名师归纳总结 先写分数线， 表示平均分；（ ）w unit on the issuing of system files, not suitable documents be revised in a timely manner. 4.6.2 processes, technology, material changes on or after an accident, and biotech branch and that the 第 3 页，共 21 页三、再写分母， 表示把单位“ 1”二、填空平均分成了几份；1把（）平均分成若干份，完表示这样的

40、（）或者（）的数最后写分子，表示有这样叫做（）。表示其中1 份的数成“的几份。叫做（）。做三、完成“ 做一做”2把单位“ 1 ” 平均分成 5一四、分数单位份，其中 3 份就是， 它的分数单做1自然数的单位是几？7 里位是（）。面有几个 1？26 呢？3把、和按从大到小2的分数单位是什么？它的顺序排列起来：（）（ ）（ ）有几个这样的单位？3引出分数单位的概念：4把、 、按从小到大排四、把单位“ 1” 平均分成若干份，列：（）（ ） （ ）表示其中一份的数叫做分数单5把 4 吨化肥分给3 个生产巩位。队，每个生产队分得这批化肥的固4说出上面“ 做一做” 中几，分别是吨。个分数的分数单位，它们分

41、别练有几个这样的单位。6甲数是 5，乙数是 3，甲数习5指出：分数单位是由分母是乙数的，乙数是两数之决定的，分母是几，分数单位就是几分之一。和的。五、巩固练习promulgated by Decre e No. 406 of the State Council promulgated by Decree of the State Council, No. 397 11 2007.06.01 production safety accident reporting, investigation and handling of Ordina nce promulgated by Decree No

42、. 493, 12 of the State Council regulations on spe cial equipment safety supervision 2009.05.01 amended Decree No. 373 State Council Decree No. 549, 13 insurance regulations regarding industrial injuries 2011.01.01 amendment, promulgated by 7某商场有男售货员Decree No. 586 of the State Council promulgated by

43、Decree No. 375, 14 administration of precursor chemicals Ordinance 2005.11.01 State Council Decree No. 445, 15 workplaces where toxic substances are used to labour protection 2002.05.12 the State Council promulgated by De16 人，cree No. 352, 16 women workers . 4.6. review and revise 4.6.1 production t

44、echnol ogy section Office once every year and orga nize relevant departments to revieworkshop should be timely to various regulations and safety rules be revised to ensure suitability and effectiveness. 4.6.3 revision of the file chcha nge approval form should be filled in, indi cating the causes and changes, approved by the Deputy in charge of security, General Manager of revision. 4.6.4 a new revised safety regulations and safety rules shoul d be released t o the post in a timely manner to ensure rules and safet