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 .pdf

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1、amended Decree No. 344 2011.12.1 the State Council promulgated by Decree No. 591, 9 Peoples Republic of China regulations on road transport 2004.07.01 2004.01.13 10 safety production license Ordinance, promulgated by Decre e No. 406 of the State Council promulgated by Decree of the State Council, No

2、. 397 11 2007.06.01 production safety accident reporting, investigation and handli ng of Ordinance promulgated by Decree No. 493, 12 of the State Council regulations on special equipment safety supervision 2009.05.01 amended Decree No. 373 State Council Decree No. 549, 13 insurance regulations regar

3、ding industrial injuries 2011.01.01 amendment, promulgated by Decre e No. 586 of the State Council promulgated by Decree No. 375, 14 administration of precursor chemicals Ordinance 2005.11.01 State Council Decree No. 445, 15 workplaces w here toxic substances are used to labour protection 2002.05.12

4、 the State Council promulgated by Decree No. 352, 16 women workers . 4.6 review and revision 4.6.1 production te chnology secti on Office organized relevant departments units once a year to review the documentation issued by, not suitable documents be revised in a timely manner. 4.6.2 processes, tec

5、hnology, material changes on or after an accident, and biotech branch and that the workshop should be timely to various regulations a nd safety rules be revised to ensure suitability and effectiveness. 4.6.3 revision of the file change approval form should be filled in, indicating the cause s and ch

6、anges, a pproved by the Deputy in charge of security, General Manager of revision. 4.6.4 a new revised safety regulations and safety rules should be released t o the post in a timely manner to ensure rules and safety regulations of each post is the latest file, recover the origi nal document unified

7、 void. 5. related records 5.1 list of applicable laws, regulations a nd standards of the invent ory listing number carbon industry laws and regulations legal regulations and other requirements came into force date enacted se ctor update record 1 /standard number People s Republic of China 2, Chairma

8、n of the national peoples Congress made the 70th production safety law 2002.11.1 People s Republic of China Law of occupational 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 Congre

9、ss 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 traffic safety law 2011.5.1, Chairman of the national pe oples Congress made the 47th, 6 Pe opl es Republic of China Trade

10、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 Congress, the 69th 8 Hazardous chemical safety management regulation amended Decree No. 344 2011.12.1 the State Council promu

11、lgated 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,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

12、, investigation and handling of Ordina nce promulgated by Decree No. 493, 12 of the State Council regulations 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, promulgat

13、ed by Decree No. 586 of the State Council promulgated by Decree No. 375, 14 admnistration 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 Decree No. 352, 16 women

14、workers . 4.6. review and revise 4.6.1 production technol ogy section Office once every year and orga 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,

15、and biotech branch and that the workshop should be timely to various regulations and safety rules be revised to ensure suitability and effectiveness. 4.6.3 revision of the file cha nge approval form should be filled in, indi cating the causes and changes, approved by the Deputy in charge of security

16、, 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 safety regulations of each post is the latest file, recover the origi nal document unified void. 5. related records 5.1 list of applicable la

17、w s, regulations a nd standards of the inventory listing number carbon industry laws and regulations legal regulations and other requirements came into force date enacted sector update recor d 1 /standard number Peoples Re public of China 2, Chairman of the national peopl es Congress made the 70th p

18、roduction safety law 2002.11.1 Peoples Republic of China Law of occupational disease prevention 2002.05.01 NPC 3, order of the President of the 60th People s Republic of China fire control law of 2009.05.01 4, Chairman of the national peoples Congre ss Standing Committee 6th Peopl es Republic of Chi

19、na labor law 2008.1.1, Chairman of the national peoples Congress Standing Committee, 65th 5 Peoples Republic of China on road traffic safety law 2011.5.1, Chairman of the national peopl es Congress made the 47th, 6 Peoples Republic of China Trade Union law 2001.10.27 7, Chairman of the national peop

20、les Congress made the 62nd Peoples Republic of China emergency response law 2007.11.1, Chairman of the national people s Congress, the 69th 8 Hazardous chemical safety management regulation amende d Decree No. 344 2011.12.1 the State Council promulgated by Decree No. 591, 9 Peoples Republic of China

21、 regulations on road transport 2004.07.01 2004.01.13 10 safety production license Ordinance, pr omulgated by Decree No. 406 of the State Council promulgated by Decree of the State Council, No. 397 11 2007.06.01 production safety accident reporng, investigation and handling of Ordinance promulgated b

22、y Decree小学集体学案（备课）用表编写时间： xxx 年月日教学课题五年级上册第四单元：分数的意义和性质学案编写者教学用课时学案使用者第周星期用教学目标课（章节）教学目标一、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

23、小公倍数，能比较熟练地进行约分和通分。教学重点与难点理解分数的基本性质。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教学准备与手段课件集体备课共性意见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。（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

24、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。精选学习资料 - - - - - - - - - 名师归纳总结 - - - - - - -第 1 页，共 21 页第一课时： 分数的意义教学过程教学环节教师活动学生活动使用者再创及反思记录一、分数的产生二、分数的意义一、分数的产生教师：我们长度可以用 “米”作单位，但是在测量物体长度时，用“米”做单位，结果往往不是整数，在古代，人们就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

25、新的概念。二、分数的意义1以前，我们已经学过分数的初步认识，你能举例说明的含义吗？2看课本插图，说一说，每个图下面的分别是：（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？3如果把改成，请再说说它的具体含义。4概括分数的意义。在我们的日常生活中， 为了平均分配一些东西， 也常常会遇到不能用整数表示的情况。比如，两个小朋友平分一个橘子、一块月饼、一包饼干， 每人分到的能用整数表示吗？根据学生的回答，教师逐步总结：把一个图形看作一个整体，平均分成 4 份，这样的一份是，三份是。把 4 根香蕉看作一个整体， 平均分成 4 份，每根是这把香蕉的，三根是。把一盘面包看作一个整体，平

26、均分成 4 份， 每份是这盘面包的，三份是。分子：表示有这样的几份分母：表示把单位“ 1 ”平均分成了几份1学生完成第62 页上的 “做一做”（填写在课本上）。精选学习资料 - - - - - - - - - 名师归纳总结 - - - - - - -第 2 页，共 21 页amended Decree No. 344 2011.12.1 the State Council promulgated by Decree No. 591, 9 Peoples Republic of China regulations on road transport 2004.07.01 2004.01.13 1

27、0 safety production license Ordinance, 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 handli ng of Ordinance promulgated by Decree No. 493, 12 of the State Council regulatio

28、ns 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 Decre e No. 586 of the State Council promulgated by Decree No. 375, 14 administration of precursor ch

29、emicals Ordinance 2005.11.01 State Council Decree No. 445, 15 workplaces w here toxic substances are used to labour protection 2002.05.12 the State Council promulgated by Decree No. 352, 16 women workers . 4.6 review and revision 4.6.1 production te chnology secti on Office organized relevant depart

30、ments units once a year to review the documentation issued by, 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 workshop should be timely to various regulations a nd safety rules be revised to

31、 ensure suitability and effectiveness. 4.6.3 revision of the file change approval form should be filled in, indicating the cause s and changes, a pproved by the De puty 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

32、 the post in a timely manner to ensure rules and safety regulations of each post is the latest file, recover the origi nal document unified void. 5. related records 5.1 list of applicable laws, regulations a nd standards of the invent ory listing number carbon industry laws and regulations legal reg

33、ulations and other requirements came into force date enacted sector update record 1 /standard number People s Republic of China 2, Chairman of the national peoples Congress made the 70th production safety law 2002.11.1 People s Republic of China Law of occupational disease prevention 2002.05.01 NPC

34、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 Committee, 65th 5 Peoples Republic of

35、 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 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 nati

36、onal 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 on road transport 2004.07.01 2004.01.13 10 safety production license Ordinance,promulgated by D

37、ecre 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. 493, 12 of the State Council regulations on spe cial equipment safety supervision 2009.05.01

38、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 promulgated by Decree No. 375, 14 administration of precursor chemicals Ordinance 2005.11.01 State Council Decree No. 4

39、45, 15 workplaces where toxic substances are used to labour protection 2002.05.12 the State Council promulgated by Decree No. 352, 16 women workers . 4.6. review and revise 4.6.1 production technol ogy section Office once every year and orga nize relevant departments to review unit on the issuing of

40、 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 workshop should be timely to various regulations and safety rules be revised to ensure suitability and effectiveness. 4.6.3 revi

41、sion of the file cha 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 s

42、afety regulations of each post is the latest file, recover the origi nal document unified void. 5. related records 5.1 list of applicable laws, regulations a nd standards of the inventory listing number carbon industry laws and regulations legal regulations and other requirements came into force dat

43、e enacted sector update recor d 1 /standard number Peoples Re public of China 2, Chairman of the national peopl es Congress made the 70th production safety law 2002.11.1 Peoples Republic of China Law of occupational disease prevention 2002.05.01 NPC 3, order of the President of the 60th People s R e

44、public of China fire control law of 2009.05.01 4, Chairman of the national peoples Congre ss Standing Committee 6th Peopl es Republic of China labor law 2008.1.1, Chairman of the national peoples Congress Standing Committee, 65th 5 Peoples Republic of China on road traffic safety law 2011.5.1, Chair

45、man of the national peopl es Congress made the 47th, 6 Peoples Republic of China Trade Uni on law 2001.10.27 7, Chairman of the national peoples Congress made the 62nd Peoples Republic of China emergency response law 2007.11.1, Chairman of the national people s Congress, the 69th 8 Hazardous chemica

46、l safety management regulation amende d Decree No. 344 2011.12.1 the State Council promulgated by Decree No. 591, 9 Peoples Republic of China regulations on road transport 2004.07.01 2004.01.13 10 safety production license Ordinance, pr omulgated by Decree No. 406 of the State Council promulgated by

47、 Decree of the State Council, No. 397 11 2007.06.01 production safety accident reporting, inve stigation and handling of Ordinance promulgated by Decree3 三、完成“做一做四、巩固练习（1）一个物体或一些物体等都可以看作一个整体，把一个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”。（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

48、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。先写分数线， 表示平均分；再写分母，表示把单位“1”平均分成了几份；最后写分子，表示有这样的几份。三、完成“做一做”四、分数单位1自然数的单位是几？7 里面有几个 1？26 呢？2的分数单位是什么？它有几个这样的单位？3引出分数单位的概念：把单位“1” 平均分成若干份，表示其中一份的数叫做分数单位。4说出上面“做一做”中几个分数的分数单位，它们分别有几个这样的单位。5指出：分数单位是由分母决定的，分母是几，分数单位就是几分之一。五、巩固练习2交流、核对答案。习题精选一、判断题1比较两个分数的大小，只要比较它们的分数单位就可以

49、，分数单位大的分数值就大分数单位小的分数值就小。（）2 4 吨的和 1 吨的同样重。（ ）3把 3 千克糖平均分成4 份，每份就是。（）4分母越大的分数值越小。（ ）二、填空1把（）平均分成若干份，表示这样的（）或者（）的数叫做（）。表示其中1 份的数叫做（）。2把单位“ 1 ”平均分成 5份，其中 3份就是， 它的分数单位是（）。3把、和按从大到小的顺序排列起来：（）（ ）（ ）4把、 、按从小到大排列：（）（ ）（ ）5把 4 吨化肥分给3 个生产队，每个生产队分得这批化肥的，分别是吨。6甲数是 5，乙数是 3，甲数是乙数的，乙数是两数之和的。7某商场有男售货员16 人，精选学习资料 -

50、- - - - - - - - 名师归纳总结 - - - - - - -第 3 页，共 21 页第二课时： 真分数和假分数六、小结：本节课我们学习的主要内容是什么？你有什么收获？女售货员 35 人，女售货员占总售货员人数的。三、分析应用汽车从 A城到 B城需要 8 小时到达。平均每小时行全程的几分之几？ 5 小时行全程的几分之几？教学过程教学环节教师活动学生活动使用者再创及反思记录（ 一 ）探讨“ 真 分数 ” 与“ 假 分数 ” 的意义（一）探讨“真分数”与“假分数”的意义1、写一个你比较喜欢的分数，把这个分数所表示的意义说给同桌同学听。2、汇报：师有代表性地板书一些分数。如：3/4,1/9