数学人教版四年级上册第三单元 测试题.docx

数学人教版四年级上册第三单元 测试题.docx

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数学人教版四年级上册第三单元测试题

数学人教版四年级上册第三单元

测试题

一、口算（16分）

 150×5=    190×2=    210÷7=      350×2=      

18×3=     60×80=      35×4=        18×50=  

30×12=     23×4=       30×80=      25×30= 

49×104≈701×99≈592×21≈89×202≈

二、填空。

（12分）

1、123个56的和是多少列式为（     ），积是（    ）。

2、180×40先口算出（   ）×（  ）的积，再在积的末尾添上（   ）个0。

3、（    ）×时间＝路程。

4、师大附小在校学生人数已达到4034人，大约是（    ）人。

5．上海磁悬浮列车每小时行驶的速度是340千米，可以简写成（      ／     ）。

6、在〇里填上“＞”、“＜”或“＝”

36×120〇 12×360            120×40 〇 10×400

24×20 〇 480×10            300×5 〇 50×30

三、判断。

（对的打“√”,错的打“×” 10分）

1、203×50积的末尾有2个0                                     （）

2、三位数乘两位数积一定是五位数。

                    （    ）

3、用5倍的放大镜看一个30度的角，看到的角的度数应该是150度。

（　　）

4、两个数相乘的积一定比其任何一个数大。

           （     ）

5、一个因数扩大（或缩小）若干倍，积也扩大（或缩小）若干倍。

    （      ）

四、轻松选择（10分）

1、两数相乘，如果一个因数扩大3倍，要使积不变，另一个因数应（    ）。

A．乘3            B.除以3             C.不变

2、两位数乘两位数的积（    ）。

A.是四位数　　　　　B.是三位数　　　　C.可能是三位数也可能是四位数

3、估算146×43，最合适的算法是（    ）。

 A．100 ×40         B.150×40             C.100×45

4、下列算式（    ）的积与340×200的积不相等。

 A．170×400         B.640×100            C.680×100

5.小明3分钟行了180米，求他每分钟行多少米？

运用数量关系是（    ）。

A．速度×时间=路程    B.路程÷速度=时间     C.路程÷时间=速度

五、算一算 （26分） 

 1、笔算 （20分）

   632×18              308×45 480×50                       109×50

2、列式计算（6分）

1、26的45倍是多少？

2、一个因数是35，另一个因数是142，积是多少？

六、解决问题（26分）

 1、王伯伯到超市买塑料桶，每个塑料桶18元，他想买5个，王伯伯带了100元，钱够吗？

（5分）

2、一个坏掉的水龙头每分钟要白白流掉168克水，15分钟要浪费掉多少克的水？

（5分）

3、学校准备发课外书，发给16个班，每班140本，还需要50本作为捐赠灾区的物品，学校应买多少本课外书？

（5分）

4、甲地到乙地共2000千米，汽车从甲地出发开往乙地，行了16小时，每小时行65千米，这时汽车离乙地还（5分）

5、张大伯把一车蔬菜送到菜市场，去时的速度是40千米/时，用了3小时送到，返回时只用了2小时，返回的速度是多少？

（6分）

whenIarrivedinBuenosAiresinthebeginningof2010,Icouldbarelyorderfoodinalocalrestaurant.Twoyearslater,IcalmlyexplainedthemechanicsofRussiangrammartoaGuatemalanfriend…inhernativeSpanish.

Today,I’mconversationallyfluentinbothSpanishandBrazilianPortuguese,andlowconversationalinRussian.I’mnotgoingtoblowsmokeupyourassandtellyouitwaseasyorthatthere’ssomeshortcutorhack.Ipracticedmyassoff.Honestly,I’veseenthesupposed“hacks”forlanguage-learning,andnoneofthemworkedforme.Ittookhoursofstudycombinedwithstumblingthroughmany,manyconversations.

Herearesomelanguage-learningtipsI’vegatheredoverthepastfewyears:

1.Conversation,Conversation,Conversation. Ifthere’sa“secret”or“hack”tolearninganewlanguage,it’sthis:

hoursandhoursofawkwardandstrenuousconversationwithpeoplebetterthanyouinthatlanguage.Anhourofconversation（withcorrectionsandadictionaryforreference）isasgoodasfivehoursinaclassroomand10hourswithalanguagecoursebyyourself.

Thereareafewreasonsforthis.Thefirstismotivation.Idon’tcarehowcoolyourstudyguideis,you’regoingtobefarmoreinvestedandmotivatedtocommunicatewithalivepersoninfrontofyouthanabookoraudioprogramonyourcomputer.

Thesecondreasonisthatlanguageissomethingthatneedstobeprocessed,notmemorized.I’mnoexpertonlanguagelearning,butinmyexperiencestaringandmemorizingawordinabookorwithflashcards100timesdoesnotstickthesamewaythatbeingforcedtouseawordinconversationameretwoorthreetimesdoes.

Ibelievethereasonisthatourmindsplacemorepriorityonmemorieswhichinvolveactualhumanandsocialexperiences,memorieswhichhaveemotionstiedtothem.So,forinstance,ifIlookuptheverbfor“tocomplain”anduseitinasentencewithanewfriend,chancesareI’malwaysgoingtoassociatethatwordwiththatspecificinteractionandconversationIwashavingwithher.WhereasIcanblowbythatsameword20timeswithflashcards,andeventhoughImaygetitright,Ihaven’tactuallypracticedimplementingit.Itmeansnothingtome,soitislesslikelytostickwithme.

2.Intensityofstudytrumpslengthofstudy. WhatImeanbythisisthatstudyingalanguagefourhoursadayfortwoweekswillbemorebeneficialforyouthanstudyingonehouradayfortwomonths.Thisisonereasonwhysomanypeopletakelanguageclassesinschoolandneverrememberanything.It’sbecausetheyonlystudy3-4hoursperweekandoftentheclassesareseparatedbymultipledays.

Languagerequiresalotofrepetition,alotofreferenceexperiences,andaconsistentcommitmentandinvestment.It’sbettertoallotaparticularperiodofyourlife,evenifit’sonly1-2weeks,andreallygoatit100%,thantohalfassitoverthecourseofmonthsorevenyears.

3.Classessuckandareaninefficientuseoftimeandmoney. Allthingsconsidered,yougetareallypoorreturnforyourtimeandeffortingroupclasses.Therearetwoproblems.Thefirstisthattheclassmovesatthepaceofitssloweststudent.Thesecondisthatlanguagelearningisafairlypersonalprocess—everyonenaturallylearnssomewordsortopicseasierthanothers,thereforeaclassisnotgoingtobeabletoaddresseachstudent’spersonalneedsaswellorinatimelyfashion.

Forinstance,whenItookRussianclassesIfoundverbconjugationstobesimplebecauseIhadalreadylearnedSpanish.ButanEnglishclassmatestruggledquiteabitwiththem.Asaresult,Ispentalotofmyclasstimewaitingaroundforhimtocatchup.IalsohadaGermanclassmatewhohadalreadybeenexposedtocases,whereasIhadnocluewhattheywere.I’msureheendedupwaitingaroundformetofigureitoutaswell.Thelargertheclassroom,thelessefficientit’sgoingtobe.Anyonewhohadtotakeaforeignlanguageinschoolandretainedabsolutelynoneofitcantellyouthis.

4.Startwiththe100mostcommonwords. Notallvocabularyismadethesame.Somegivesyouabetterreturnoninvestmentthanothers.Forinstance,whenIlivedinBuenosAires,ImetaguywhohadbeenstudyingwithRosettaStoneformonths（notrecommended）.Ihadbeenworkingonandoffwithatutorforafewweeks,butIwassurprisedbyhowhecouldnotfolloweventhemostbasicofconversationsdespitemonthsofstudyandlivingthere.

Itturnsout,muchofthevocabularyhehadbeenstudyingwasforkitchenutensils,familymembers,clothingandroomsinahouse.Butifhewantedtoasksomeonewhichpartoftowntheylivedin,hehadnoideawhattosay.

Startwiththe100mostcommonwordsandthenmakesentenceswiththemoverandoveragain.Learnjustenoughgrammartobeabletodothisanddoituntilyoufeelprettycomfortablewithallofthem.

5.Carryapocketdictionary. ThismadeamuchbiggerdifferencethanIexpected.IcarryanEnglish-SpanishdictionaryapponmyphoneandIuseditallthetimewhenIliveinSpanish-speakingcountries.MyfirsttwoweeksinBrazil,IwaslazyandkeptforgettingtodownloadanEnglish-Portugueseapplication.IstruggledinmyconversationsALOTduringthosetwoweeks,despiteknowingbasicPortuguese.

OnceIdownloadedthedictionary,therewasanimmediatedifference.Havingitonyourphoneisgreat,becauseittakestwosecondstolooksomethingupinthemiddleofconversation.Andbecauseyou’reusingitinconversation,you’rethatmuchmorelikelytorecallitlater.Evensomethingthatsimpleaffectedmyconversationsandabilitytointeractwithlocalsagreatdeal.

6.Keeppracticinginyourhead. Theotheruseforyourdictionaryisthatyoucanpracticewhilegoingaboutyourdayandnottalkingtoanyone.Challengeyourselftothinkinthenewlanguage.Weallhavemonologuesrunninginourhead,andtypicallytheyruninournativetongue.Youcancontinuetopracticeandconstructsentencesandfakeconversationsinyourheadinanewlanguage.Infact,thissortofvisualizationleadstomucheasierconversationswhenyouactuallyhavethem.Forinstance,youcanenvisionandpracticeaconversationaboutatopicyou’relikelytohavebeforeyouactuallyhaveit.Youcanbegintothinkabouthowyouwoulddescribeyourjobandexplainwhyyou’reintheforeigncountryinthenewlanguage.Inevitably,thosequestionswillcomeupandyou’llbereadytoanswerthem.

7.You’regoingtosayalotofstupidthings.Acceptit. WhenIwasfirstlearningSpanish,IoncetoldagroupofpeoplethatAmericansputalotofcondomsintheirfood.Later,Itoldagirlthatbasketballmakesmehorny.Um,yeah…It’sgoingtohappen.Trustme.

8.Figureoutpronunciationpatterns. AllLatin-basedlanguageswillhavesimilarpronunciationpatternsbasedonLatinwords.Forinstance,anywordthatendsin“-tion”inEnglishwillalmostalwaysendin“-ción”inSpanishand“-ção”inPortuguese.English-speakersarenotoriousforsimplyadding“-o”“-e”or“-a”totheendofEnglishwordstosaySpanishwordstheydon’tknow.Butstereotypesaside,it’ssurprisinghowoftenit’scorrect.“Destiny”is“destino,”“motive”is“motivo,”“part”is“parte”andsoon.InRussian,caseendingsalwaysrhymewithoneanother,soifyouaretalkingaboutafemininenoun（suchas“Zhen-shee-na”）,thenyouknowthattheadjectivesandadverbswillusuallyrhymewithitsending（“krasee-vaya”asopposedto“krasee-vee”）.

9.Useaudioandonlinecoursesforthefirst100wordsandbasicgrammar. Afterthattheyshouldonlybeusedforreferenceandnothingmore.Therearealotofstudymaterials:

Pimsleur,RosettaStone,Berlitz,DuoLingo,etc.Thesecoursesaregreatforgettingyoufromabsolutelynoabilityinalanguagetobeingabletospeakbasicsentencesandphraseswithinafewdaystime.They’realsogoodforteachingthemostfundamentalvocabulary（wordssuchas:

the,I,you,eat,want,thanks,etc.）.

Buttheweaknessofstudymaterialsisthattheydon’tallowformuchusefulpractice.Thegreatestreturnoninvestmentinlanguagelearningisforcingyourselftospeakandcommunicatewithothers,andw