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1、数学人教版四年级上册第三单元测试题一、口算（16分）1505= 1902= 2107= 3502=183= 6080= 354=1850= 3012= 234= 3080=2530= 49104 70199 59221 89202 二、填空。（12分）1、123个56的和是多少列式为（ ），积是（ ）。2、18040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、在里填上“”、“”或“”36120 12360 1204010400242048
2、010 30055030三、判断。（对的打“”,错的打“”10分）1、20350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14643，最合适的算法是（）。A10040B.15040C.10
3、0454、下列算式（）的积与340200的积不相等。A170400B.640100C.6801005.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）6321830845 48050109502、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
4、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）when I arrived in Buenos Aires in the beginning of 2010, I could barely order food in a local restaurant. Two years later, I calmly ex
5、plained the mechanics of Russian grammar to a Guatemalan friend in her native Spanish.Today, Im conversationally fluent in both Spanish and Brazilian Portuguese, and low conversational in Russian. Im not going to blow smoke up your ass and tell you it was easy or that theres some shortcut or hack. I
6、 practiced my ass off. Honestly, Ive seen the supposed “hacks” for language-learning, and none of them worked for me. It took hours of study combined with stumbling through many, many conversations.Here are some language-learning tips Ive gathered over the past few years:1. Conversation, Conversatio
7、n, Conversation.If theres a “secret” or “hack” to learning a new language, its this: hours and hours of awkward and strenuous conversation with people better than you in that language. An hour of conversation (with corrections and a dictionary for reference) is as good as five hours in a classroom a
8、nd 10 hours with a language course by yourself.There are a few reasons for this. The first is motivation. I dont care how cool your study guide is, youre going to be far more invested and motivated to communicate with a live person in front of you than a book or audio program on your computer.The se
9、cond reason is that language is something that needs to be processed, not memorized. Im no expert on language learning, but in my experience staring and memorizing a word in a book or with flashcards 100 times does not stick the same way that being forced to use a word in conversation a mere two or
10、three times does.I believe the reason is that our minds place more priority on memories which involve actual human and social experiences, memories which have emotions tied to them. So, for instance, if I look up the verb for “to complain” and use it in a sentence with a new friend, chances are Im a
11、lways going to associate that word with that specific interaction and conversation I was having with her. Whereas I can blow by that same word 20 times with flashcards, and even though I may get it right, I havent actually practiced implementing it. It means nothing to me, so it is less likely to st
12、ick with me.2. Intensity of study trumps length of study.What I mean by this is that studying a language four hours a day for two weeks will be more beneficial for you than studying one hour a day for two months. This is one reason why so many people take language classes in school and never remembe
13、r anything. Its because they only study 3-4 hours per week and often the classes are separated by multiple days.Language requires a lot of repetition, a lot of reference experiences, and a consistent commitment and investment. Its better to allot a particular period of your life, even if its only 1-
14、2 weeks, and really go at it 100%, than to half ass it over the course of months or even years.3. Classes suck and are an inefficient use of time and money.All things considered, you get a really poor return for your time and effort in group classes. There are two problems. The first is that the class moves at the pace of its slowest student. The second is that l
