最新新人教版小学数学五年级下册运用最小公倍数知识解决实际问题课件PPT.ppt 31页

'新人教版小学数学五年级下册运用最小公倍数知识解决实际问题 1、什么叫几个数的公倍数？怎么找两个数的公倍数及最小公因数？2、下面每组中两个数的最小的公倍数是多少？6和85和712和36复习铺垫 请仔细看看小明家装修的要求，你获得了哪些有价值的信息？①要用这种长是3dm，宽是2dm的墙砖铺一个正方形。②使用的墙砖必须都是整块的，不能切割开用半块的。③问题：铺好的正方形的边长可以是多少分米，最小是多少分米？如果用这种墙砖铺一个正方形（用的墙砖必须都是整块），正方形的边长可以是多少分米？最小是多少分米？自主探疑 汇报展示 我们长2dm、宽3dm的长方形可以拼出多少个边长不一样的大正方形呢？说说理由。用这样的长方形可以拼成边长是8dm的正方形吗？说说理由。不能。因为8是2的倍数，不是3的倍数，拼不成边长是8的正方形。汇报展示 有一堆糖，4颗4颗地数，6颗6颗地数，都能刚好数完。这堆糖至少有多少颗？答：因为4和6的最小公倍数是12，所以这对糖至少有12颗。练习测评 如果这些学生的总人数在40人以内，可能是多少人？咱们可以分成6人一组，也可以分成9人一组，都正好分完。答：因为40以内6和9的公倍数有18、36；所以可能是18人或36人。 答：因为4和6的最小公倍数是12；所以下一次在给这两种花同时浇水是12天后，也就是5月13日。 答：因为6和8的最小公倍数是24；所以至少过24分钟两路车才第二次同时发车。 （1）答：因为3和4的最小公倍数是12；所以至少12分钟后两人在起点再次相遇。12÷3＝4（圈）12÷4＝3（圈）此时爸爸跑了4圈，妈妈跑了3圈。 拓展延伸1和362和363和364和366和369和3612和364和912和18 Module6:EntertainmentUnit1ShesaidChinawasaveryexcitingplace Lead-in:1.Doyoulikelisteningtomusic?2.Whatdoyoulikedoingwhenyouarefree?3.What’syourfavoriteentertainment? Entertainment Whatdidhesay?Ilikefootball.Hesaid(that)helikedfootball. Whatdidshesay?MyfavoritebandisS.H.E.ShesaidherfavoritebandwasS.H.E. ListenandreadIndirectSpeechDirectSpeechShesaidthatshewaswithsomeclassmates.Shesaid,“I’mwithsomeclassmates”.Shesaid,“I’mstudyingChinese.”Shesaidthatshemissedherparents.“Chinaisaveryexcitingplace,”shesaid.ShesaidthatshewasstudyingChinese.Shesaid,“Imissmyparents.”ShesaidthatChinawasaveryexcitingplace. AWhispergameS1WhisperthemessagetoS2.thenS2whispertoS3aboutwhatheheard,andsoon.Thelastoneofeachteamstandsupandreports:Hesaidthat… Listenandwritenotes1.Whoisspeaking?2.Wheredoesittakeplace?3.Whattimeofdayisit?SallyMaxwellandChenHuan(arespeaking)IttakesplacesatRadioBeijing.It’slateatnight. Answerthequestions,Usethewordsintheboxtohelpyou.1.WhatdoesthemansayaboutSally?2.whatdoesthemanthinkofthemusic?3.Whatdoesthemantellthelistenerstodoiftheyareawake?4.Whatdoesthemantellthemtodoiftheyaretoosleep?amongawakebelievebesidecheerclapfantasticplentysleepworryHesaysthatsheplaystheviolinreallywell.It’sfantastic.Hetellsthemtostandbesidetheirbedsanddanceandcheer.Hetellsthemtostayinbedandclapyourhands. ListenandanswerthequestionsWhydidn’tBettyhearSally’sinterviewontheradio?WhatdoesSallythinkisthemainreasonforhervisit?WhydidDamingwanttocapandcheer?WhydoesBettythinktheyshouldlookafterSally?Becauseshewastoosleepy.Tomakefriends.BecauseSallyplayedtheviolinverywell.BecauseBettythinksthatSallyisunhappy. Languagepoints:takeplace:发生(非偶然性的”发生,举行”)happen:发生(突然性,强调偶然及意外),碰巧昨天他发生什么事?________________________________________yesterday?自从1980年以来,我国已发生了巨大的变化.Greatchange______________________inourcountrysince1980.Whathappenedtohimhavetakenplaceamong:在…中间(三者或以上)between:在…中间/之间(在两者之间)Wehadarest_______________thetrees.Hesits_________thetwins.amongbetween 3.(be)awake:adj.醒着的----asleep(反义词)wake:v.醒来,醒着wake—woke--wakenEg:孩子们还没有睡着吗?_________thechildrenstill___________?Areawake拓展:wakeup:醒来wakesbup:叫醒某人1)早上他经常很迟醒来.Heoften_____________________inthemorning.2)今天早上妈妈六点叫醒我.Mymother___________________atsixthismorning.wakesupwokemeup4.thinkofsb/sth:想起,觉得,认为…thinkaboutsb/sth:考虑… eg:你觉得那部电影怎样?What________you_________________thefilm?我正在考虑去哪里.I___________________________________________.dothinkofamthinkingaboutwheretogo5.No,Iwastoosleepy.没有呀,我太困了.sleep:睡觉(动词)beasleep:adj.睡着的,熟睡(只能放在be后面)sleepy:adj.困倦,瞌睡;贪睡的,懒惰的(放在be/feel后面,名词前面)Eg:Thebabylooks____________.Don’tmakeanynoise.Thebabyis______________.Icouldn’t_____________welllastnight.sleepyasleepsleepasleepingchild:一个睡着的孩子 6.ShesaidthatshewaswithsomeclassmatesfromLondon,andthatshewasstudyingChinese.她说她和一些来自伦敦的同学在一起,她在学习中文.这是转述别人的话,英语中叫间接引语.托尼说这是一场很令人兴奋的电影.Tonysaidthatit_______________________________film.玲玲说她不喜欢动作片.Lingling_________thatshe________________________films.wasanexcitingsaiddidn’tlikeaction7.Shesaidthatshemissedherparentsbutshehadsomeclosefriendshere.她说她想念她的父母,但她在这里有一些亲密的朋友.miss:①想念他经常想念父母.Heoftenmisseshisparents.②错过,未赶上我迟到了因为我误了公共汽车.IwaslatebecauseImissedthebus. 8.That’sus!那正是我们!9.Sheexplainedthathervisitwasaboutmakingfriends.她解释说她来参观中国就是关于交朋友.explainsthtosb:向某人解释某事你能向他解释我们的计划吗?________you__________ourplan______________?Canexplaintohim10.Wasthatit?就这些吗?口语中常常用“That’sit.”表示“就这样”.11.Andfinally,heplayedtherecordingofSally’smusic.12.beworriedaboutsb/sth:担心某人/事妈妈总是担心他们的孩子.Mothers_________often________________theirchildren.areworriedabout Gammar直接引语和间接引语直接引述别人的原话,叫做直接引语;用自己的话转述别人的话,叫做间接引语.间接引语一般构成宾语从句.直接引语必须放在引号内,间接引语则不用引号.直接引语改为间接引语时,除将引语部分变成宾语从句外,它的变化规律:一般现在时变为一般过去时:is/am变为was;are变为were人称变化规律:I变为He/She,Tomsaid,“Itistimeforclass.”(直接引语)→Tomsaidthatitwastimeforclass.(间接引语)Lucysaid,“Idon’tlikewatchingTV.”.(直接引语)→Lucysaidthatshedidn’tlikewatchingTV(间接引语) 7.WritedownwhatSallysaidintheinterviewwithChenHuanShesaidthatshewaswithsomeclassmatesfromLondon…“ImwithsomeclassmatesfromLondon.”shesaid.…(shesaid)thatshewasstudyingChinese.Shesaidthatshemissedherparentsbutshehadsomeclosefriendshere.AndshesaidChinawasaveryexcitingplease.Butshedidn’tlikethewordforeigner”“I’mstudyingChinese,”shesaid“Imissmyparents,butIhavesomeclosefriendshere”shesaid.“It’saveryexcitingplace..ButIdon’tliketheword‘foreigner’,”shesaid.'