人教版四年级下册数学期末总复习(完整版)教学讲义课件.ppt

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1、人教版四年级下册数学期末总复习(完整版)把两个数()成一个数的运算,叫做加法。和=加数+加数加数=和-另一个加数已知两个数的()与其中的一个(),求()的运算,叫做减法。差=被减数-减数减数=被减数-差被减数=减数+差求几个()的()的简便运算,叫做乘法。积=因数因数因数=积另一个因数已知两个因数的()与其中的一个因数,求()的运算,叫做除法。商=被除数除数除数=被除数商被除数=商除数合并和加数另一个加数相同加数和积另一个因数减法和加法的关系:()是()的逆运算乘法和除法的关系:()是()的逆运算减法 加法除法 乘法 240=60,求的关系式是()A.被除数除数=商B.商除数=被除数C.被除数

2、商=除数C根据加、减、乘、除法各部分间的关系,分别写出另外两个算式。925438923854754629294675189063301890306386436242436864在一个算式里,既有小括号,又有中括号,要先算()里面的,再算()里面的,最后算中括号外面的。例子:21(900+27)9小括号 中括号注意:0乘()都得0 注意00=()0除以任何()的数都得0,判断:0可以作被除数,0不可以作除数。任何数0非0(1)96减去35的差,乘63与25的和,积是多少?(2)25的4倍除以10的一半,商是多少?列式计算(1)20和5的积是153与47的和的多少倍?(2)540除以3与6的和的2

3、倍,商是多少?列式计算 在 里填上合适的数,然后列出综合算式。P111第3题160 88020 230 6231 550104020800(160880)2020800142604601010550(2306231)1010在列综合算式时,同学们一定要注意小括号的使用啊!+60 36+32120963360 王老师和李老师带30个同学去划船,大船每条坐6人,需要72元,小船每条坐4人,需要60元。怎样租船最省钱?30+2=32(人)326=5(条).2人大船:5-1=4(条)6+2=8(人)小船:84=2(条)724+602=(元)答:租4条大船和2条小船最省钱。大船每个座位:726=12(元

4、)小船每个座位:604=15(元)1.二年级有108人,四年级比二年级的3倍还多2人,求四年级有多少人?1203+2=360+2=362(人)答:四年级有362人。2.杨树有30棵,比桃树的4倍多2棵,求桃树有几棵?(30-2)4=284=7(棵)答:桃树有7棵。1.小明从家去学校要走450米,每天要走两个来回,她5天要走多少米?45045列式要解释得通21(900+27)921(900+93)938256+722500-(75-253)498(96+35)(764-764)各种题目要求的不同 简便计算 灵活计算下面各题 计算下面各题(能简便就简便)用你喜欢的方法计算下面各题 脱式计算前面是除

5、号,加括号或者去括号要变号前面是乘号,加括号或者去括号不变号前面是减号,加括号或者去括号要变号前面是加号,加括号或者去括号不变号25(48)25(4+8)71199+7171997110171101-71358+356-435358+352-432125251258125863+37-63+37182-54-46+18350014528(150+128)365-29812588120008125350014=3500(72)=350072=5002120008125=12000(8125)=120001000=12365-298=365-(300-2)=365-300+2=65+2=67125

6、88=125(80+8)=12580+1258=10000+1000=11000=250350014=3500(72)=350072=5002120008125=12000(8125)=120001000=12365-298=365-(300-2)=365-300+2=65+2=6712588=125(80+8)=12580+1258=10000+1000=11000=25025(48)=(254)8=1008=80025(4+8)=254+258=100+200=30071199+71=71199+711=71(199+1)=71200=142007199=71(100-1)=71100-7

7、11=7100-71=702971101=71(100+1)=71100+711=7100+7171101-71=71(101-1)=71100=7100358+356-435=35(8+6-4)=3510=350358+352-4=35(8+2)-4=3510-4=350-4=346=71713212525=(48)12525=(8125)(425)=100010012581258=10001258=88=6412581258=12512588=(125125)(88)=16463+37-63+37=100-63+37=37+37=74=1000000=6463+37-63+37=63-63

8、+37+37=(63-63)+(37+37)=0+74=74182-54-46+18=182+18-54-46=(182+18)-(54+46)=200-1002.8+1.2-2.8+1.2=4-2.8+1.2=1.2+1.2=2.43.47-5.45+7.53-4.55=3.47+7.53-5.45-4.55=(3.47+7.53)-(5.45+4.55)=11-10=1=1002.8+1.2-2.8+1.2=2.8-2.8+1.2+1.2=(2.8-2.8)+(1.2+1.2)=0+2.4=2.412.35+5.78+6.65+14.22=12.35+6.65+5.78+14.22=(12

9、.35+6.65)+(5.78+14.22)=19+20=3912.35+5.78+6.65+14.2=12.35+6.65+5.78+14.2=(12.35+6.65)+(5.78+14.2)=19+19.98=38.98P111第2题6.425.8 7.5 2.542425125 70b320 3 第四单元小数的意义和性质小数vs分数 1、把下面分数改写成小数。把下面小数改写成分数。0.0160 一位小数表示分母是(),计数单位是()或者()依次类推 两位小数表示分母是(),计数单位是()或者()三位小数表示分母是(),计数单位是()或者()10 十分之一0.1100 百分之一0.0110

10、00千分之一0.001 小数的数位顺序表万位千位百位十位个位十分位百分位千分位万分位万千 百 十一(个)十分之一百分之一万分之一千分之一易错题:小数部分数位的最高位是()。整数部分的最低位是()。它们之间的进率是(),它们的计数单位相差()十分位个位101-0.1=0.9 0.9(3)10.025是由1个()、2个()和5个()组成的。(4)4个十、8个百分之一、5个千分之一组成的数是()。(2)23.160的整数部分的最高位是()位,小数部分的最低位是()位。(1)判断:每两个计数单位间的进率是10十相邻千分十百分之一千分之一1 0.0 2 5十个十分百分千分十 个十分百分千分4 0.0 8

11、 540.0852、在下面的数轴中,上面填分数,下面填相应的小数。01 2(1)0.30.9 1.4 1.8(2)00.1 0.20.060.130.19400903、小数的读法:0.0009040090.00090四万零九十零点零零零九零四万零九十点零零零九零有一个数,百位、十位和十分位上都是7,个位和百分位上都是0,这个数写作()。由5个10,4个0.1和7个0.01组成的数是()。1.05里面有()个0.011.05里面有()个1,()个0.01判断:1.05里面有5个0.01。770.7050.471051 5小数的末尾添上0或去掉0,小数的大小不变。这叫做小数的性质。小数的性质(1)

12、0.09的计数单位是(),改写成千分之一为计数单位的数是()(2)0.700的计数单位是(),改写成十分之一为计数单位的数是()(3)判断:0.2和0.20大小相等,意义相同,精确度相同。百分之一 百分之一0.090 0.090千分之一 千分之一0.7 0.74.504.5 1.99811.231.3 6.86.781.231.234 20.998=判断:1.小数的大小与位数无关2.整数一定大于小数 3.大于0.4而小于0.6的小数有无数个4.大于0.4而小于0.6的一位小数有1个5.大于6而小于7的一位小数有9个下面与3最接近的是()A.3.02 B.2.99 C.3.0023.02-3=0

13、.023.02-3=0.023-2.99=0.013-2.99=0.013.002-3=0.0023.002-3=0.0020.020.020.010.010.0020.002C7、小数点的移动小数点向右移:移动一位,小数就扩大到原数的10倍;移动两位,小数就扩大到原数的100倍;移动三位,小数就扩大到原数的1000倍;小数点向左移:移动一位,小数就缩小到原数的;移动两位,小数就缩小到原数的;移动三位,小数就缩小到原数的;15150.040.040.030.03100100(1)2.3去掉小数点后所得的数是原数的()倍。(2)2.3去掉小数点后比原数多()101023-2.3=20.723-2

14、.3=20.720.720.7(1)1.96至少要加上()个百分之一才能得到一个整数。(2)0.24的计数单位是(),要加上()个这样的计数单位才能得到1。44百分之一百分之一76762-1.96=0.042-1.96=0.041-0.24=0.761-0.24=0.76背诵左移缩小,右移扩大移动一、二、三位是10、100、1000倍数位不足补0多余的0不写10101010101010001000100100100100100001000010010010001000 10001000乘乘除除(1)()米=67厘米(2)24公顷=()平方米(3)2平方米4平方分米=()平方米(4)5千克25克

15、=()克(5)14.26吨=()吨()千克0.670.672400002400002.042.04502550251414260260用小数计算下面各题10平方米-5平方米4平方分米=0.9+0.10-0.043=0.9+0.10-0.043=1.00-0.043=1.00-0.043=0.957=0.9574米8厘米-2米5厘米=4.08=4.08米米-2.05-2.05米米=2.032.03米米5吨2千克+35千克=5.0025.002吨吨+0.035+0.035吨吨=5.0375.037吨吨=1010平方米平方米-5.04-5.04平方米平方米=4.964.96平方米平方米9、小数的近似

16、数(用“四舍五入”的方法):(1)保留整数,表示精确到(),要看()进行四舍五入。(2)保留一位小数,表示精确到(),要看()进行四舍五入。(3)保留两位小数,表示精确到(),要看()进行四舍五入。个位个位十分位十分位十分位十分位百分位百分位百分位百分位千分位千分位0.980910.98091.00.98090.980.98090.9813.000933.00093.03.00093.003.00093.0019.9905109.990510.09.99059.999.99059.9911.改写成万作单位,再保留整数78023000=_2.改写成亿作单位,再精确到百分位557000000=_2

17、39944400=_1.近似数为6.20的最大三位小数是(),最小三位小数是()2.近似数为99.0的最大两位小数是(),最小两位小数是()6.2046.2046.1956.19599.0499.0498.9598.95由三条()围成的图形(每()两条()的端点())叫做三角形。线段 相邻线段 相连第一关三角形有()条边,()个顶点,()个角。边边边角角角顶点顶点顶点333底高顶点底高 底高底高底高底底高高把一个三角形剪成3个小三角形,这3个小三角形的内角和都是()度180 三角形的分类按角分按边分锐角三角形直角三角形钝角三角形等腰三角形等边三角形不等边三角形3个角都是锐角有1个角是直角有一个

18、角是钝角有两边或三条边都相等的三角形3条边都不相等的三角形等腰三角形腰 腰底顶角底角 底角腰 腰底角 底角顶角底等腰三角形的两个腰(),两个底角()。相等 相等底度数:等边三角形的三条边(),三个角(),都是()度,它又叫()。相等 相等60正三角形(1)一个三角形最少有()个锐角,最多有()个锐角(2)一个三角形最多有()个直角,最多有()个钝角(3)直角三角形中,()比直角边都长(4)三角形具有()性2311斜边稳定1.近似数为6.20的最大三位小数是(),最小三位小数是()2.近似数为99.0的最大两位小数是(),最小两位小数是()6.2046.2046.1956.19599.0499.

19、0498.9598.95只有两个锐角,没有钝角只有锐角,有两条边相等三条边相等最大的一个角比直角大等腰三角形等边三角形锐角三角形钝角三角形直角三角形1.等边三角形一定是锐角三角形2.锐角三角形一定是等边三角形3.等边三角形一定是等腰三角形4.等腰三角形一定是等边三角形5.等腰三角形一定是锐角三角形 三角形任意两边的和()第三边如果一个三角形两条边分别是4cm和7cm,另一条边可能是几厘米?(整厘米数)大于一个三角形的两条边分别是3cm和8cm,它的第三条边最多是()cm,最少是()cm10 9 8 7 6 5 4 10 6一个等腰三角形的一个角是40,另外两个角分别是()(A)70和70(B)

20、40和100(C)A.B都有可能一个等腰三角形的两条边分别是4和8,周长是()(A)16(B)20(C)A.B都有可能CB课本P110 判断以下几组小棒或几个角能否围成三角形,能的打“”(1)7 cm 21cm 16 cm()(2)13cm 13 cm 13cm()(3)40 40 40()(4)40 90 50()(5)7cm 2cm 2cm()1000张纸的厚度是10cm,那么10张纸的厚度是多少厘米?已知100kg大豆可以榨45kg油,那么1000kg大豆可以榨多少kg油?易错题:1.最大的一位小数是0.9 2.最小的一位小数是0.1(1)笔算小数时,注意()对齐,也就是()对齐。(4)

21、整数的运算定律在小数运算中同样适用。(5)小数加、减混合运算的运算顺序与整数加、减混合运算的运算顺序相同。(2)判断:笔算得数的小数部分末尾有0,一般要把0 去掉,给小数化简。(3)在表示近似数时,小数末尾的0 可以去掉小数点 相同数位2.小明有9.3元,比小刚少6元,小刚有()元。1.被减数不变,减数减少0.2,差()3.两点间所有连线中()最短,它的长度叫做()4.判断:有一个角是锐角的三角形叫做锐角三角形增加0.215.3线段两点间的距离6.近似数是5.46,小数部分有三位的小数有()个5.判断:100个0.01和1000个0.001大小相等。7.当三角形中两个内角的和等于第三个角,这是

22、一个()三角形。9直角8.判断:钝角三角形和直角三角形都只有两个锐角。(1)482-98=482-100-2判断(2)2000(1258)=20001258(3)96199=96200-1(4)34101=34100+1(5)452-64+36=452-(64+36)1.小明跑步用了10.2秒,小华用了10.13秒,谁的成绩好?2.填相邻的整数。()10.9()()0.3()10.210.13,小华成绩好10 111 0Unit 1Friendship高考试题 目标考点 教材原文对照1.Alexander tried to get his work _in the medical circle

23、s.(10辽宁卷)A.to recognize B recognizing C.recognize D Recognized考查:非谓语动词。get sth.done“让某人做某事”。When he/she borrowed it last time,he/she broke it and you had to pay to get it repaired.2.Would you please _ the paper for me and see if there are any obvious mistakes?(09湖北卷)A.look around B look into C.look

24、up D look through考查:短语动词。look through“仔细查看;浏览”。Its no pleasure looking through these any longer because nature is one thing that really must be experienced.词义辨析1She refused to offer any help,which quite _ all the people present.Aignored Bsettled Cupset Dsuffered2“If you _ your diet,trouble will foll

25、ow,”my doctor warned me.Apack Bignore Crecover Dconcern3He devoted himself _ to his research work,having no time for play.Aexactly Bgratefully Cloosely DEntirely4Im afraid its not within my _ to get the work done in such a short time.Aenergy Bstrength Cpower DForce5She drew back the _ at nine in the

26、 morning to let some sunlight in.Acurtains Bsuitcases Cpartners DTeenagers答案:1.C 2.B 3.D 4.C 5.A 6I cant express how _ I am for all youve done for me.Agrateful Bloose Ccalm Dentire7In order to build the dam,they moved the local people and _ them in another place.Arecovered Bignored Cconcerned Dsettl

27、ed8The doctors are delighted to find that the patient is beginning to _ from heart trouble.Auncover Bdiscover Crecover Dcover9The train arrived at _ 8 oclock,neither earlier nor later.Aclearly Bexactly Cwidely Dnearly10Steve gave me some useful _ on how to take good pictures.Apowers Btips Citems Dth

28、unders答案:6.A 7.D 8.C 9.B 10.B.短语填空add up;calm down;be concerned about;go through;set down;on purpose;get/be tired of;pack up;get along with;look through1How does she keep smiling after all she has _?2Ive always found him a bit difficult to _.3_ your scores and we will see who wins.4I _ watching tele

29、vision;lets go for a walk.5Ive _ all my papers but I still cant find the contract.答案:1.gone through2.get along with3.Add up4.am tired of5.looked through6How can you expect me not to _ my own son?7Jacks been really annoying me and I think hes doing it _.8We arrived just as the musicians were _ their

30、instruments.9He took a few deep breaths to _.10I will _ in my notebook the story as it was told to me.答案:6.be concerned about7.on purpose8.packing up9.calm himself down10.set down.完成句子1She and her family hid away for nearly twentyfive months _(后来被发现了)(discover)2I dont want to set down a series of fa

31、cts in a diary _(像大多 数人那样)(most)3I _(有意不睡觉)until half past eleven one evening in order to have a look at the moon.(stay)答案:1.before they were discovered 2.as most people do 3stayed awake on purpose.模仿造句1Your friend cant go until he finishes cleaning his bicycle.翻译昨天晚上我做完全部作业后才去睡觉。_2While walking the

32、 dog,you were careless and it got loose and was hit by a car.翻译在路边等公交车时,我发现地上有个钱包。_3You will tell him that he should have studied.翻译他没有通过考试,他以前该更加努力地学习的。_答案:1.I didnt go to bed yesterday evening until I finished doing all my homework.2While waiting for the bus by the roadside,I found a wallet on the

33、 ground.3He didnt pass the exam.He should have studied a bit harder.4Its because I havent been able to be outdoors for so long that Ive grown so crazy about everything to do with nature.翻译就是因为我迟到了,老师才不高兴的。_5It was the first time in a year and a half that Id seen the night face to face.翻译那是我平生第一次来到长城

34、参观。_答案:4It was because I was late for class that the teacher was upset.5It was the first time in my life that I had come to the Great Wall for a visit.热点追踪1upset vt.使心烦意乱;使苦恼;使伤心【考什么?】upset oneself about sth.为某事而烦恼 be/get upset about sth.为某事而烦恼或难过【怎么考?】The children are terribly _ by the breakup of t

35、heir parents marriage.Arelieved Beased Cupset Dcomforted Dont upset yourself _ itlets just forget it ever happened.Afor Bwith Cabout DuponTheres no point _ upset about the mistake.Be careful next time.Amaking Btaking Cgoing Dgetting【课堂笔记】_ _【教师备课】Try not to upset yourself about losing your job.尽量不要为

36、失去工作而烦恼。She was still upset about the argument shed had with Harry.她依然为跟哈里发生的争论而感到烦恼。2dislike vt.不喜欢;讨厌【考什么?】dislike doing sth.不喜欢做某事;讨厌做某事 dislike ones doing sth.不喜欢某人做某事;讨厌某人做某事 dislike it when.讨厌【怎么考?】Some bosses dislike _ people to share their responsibilities;they keep all important matters tig

37、htly in their own hands.Aallowing Bto allow Callow Dallowed Her father _ her staying away from home,for her safety of course.Adisagrees BDislikes Cdisapproves DdismissesI dislike _ when others laugh at me in public or think poorly of me behind.Athat Bthose Cit Dthem【课堂笔记】_【教师备课】Tom dislikes going to

38、 the dentist;thats why hes crabby.汤姆不喜欢去看牙医,所以他脾气那么坏。He disliked her staying away from home.他不愿意让她住在外面。He disliked it when she behaved badly in front of his mother.他讨厌她在母亲面前举止失当。3concern vt.使担忧;使烦恼;对负责;与有牵连 n.关系;担心;忧虑;关心的事【考什么?】concern oneself about/be concerned about为担忧 concern oneself with/be conc

39、erned with关注;涉及;关于 concerning关于【怎么考?】_ about sons future,the mother has been sleeping very badly these months.AConcerning BConcerned CTo concern DHaving concerned An increasing number of people are concerning themselves _environmental problems.Awith Bat Cof DonIn his letter to the manager,he asked s

40、everal questions _ the future of the company.Aconcerned Bbeing concerned Cconcerning Dto concern【课堂笔记】_【教师备课】More and more people are concerning themselves with environmental problems.越来越多的人关心起环境问题。The development of economy is a major concern of the government.经济发展是政府关心的主要问题。He asked a few question

41、s concerning Chinas economic reform.他问了几个有关中国经济改革的问题。4go through 通过;穿过;经受;仔细检查;完成【怎么考?】When we are getting excited,angry or scared,our bodies also _ many physical changes.Ago over Bgo around Cgo through Dgo for They _ the rooms,being careful not to touch anything,as they did not want to hinder the police in their search for fingerprints.Awent through Bcame through Cbroke through Dlived through【课堂笔记】_【教师备课】Someone had broken into the office and gone through all the drawers.有人闯入办公室翻遍了所有的抽屉。We cant really imagine what theyre going through.我们难以想象他们所正在经历的。链接go over检查,复习get through通过;完成

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