分数原是指整体的一部分，或更一般地，任何数量相等的部分。表现形式为一个整数a和一个整数b的比（a为b倍数的假分数是否属于分数存在争议）。分数表示一个数是另一个数的几分之几，或一个事件与所有事件的比例。把单位“1”平均分成若干份，表示这样的一份， 以下是为大家整理的关于好分数5篇 , 供大家参考选择。
好分数5篇
【篇1】好分数
一、填空
1． 5/8的分数单位是（ ），它有（ ）这样的单位，再添上（ ）个这样的单位，结果是4．
2．分数单位是 1/7的真分数有（ ）．
3．分数单位是1/9 的最大真分数是（ ），最小假分数是（ ），最小带分数是（ ）．
4．9个 1/8组成的分数是（ ）它比1（ ），是（ ）分数．
5．8个 1/9 组成的分数是（ ），它比1（ ），是（ ）分数．
6、2里面有（ ）1/4,有（ ）个1/6,1里有（ ）个。
7、自然数a和b（a,b不为0），当a( )b时，是真分数，当a（ ）b时，是假分数。
8、当x/16是真分数时，x是（ ），是假分数时,x( )。16/x是假分数时x（ ）。
9、分母是5的真分数一共有（ ）个．
10、一个最简分数，它的分子和分母的积是24，这个分数是（ ）或（ ）
11、分母是8的所有最简真分数的和是（ ）．
12、一个最简分数，把它的分子扩大3倍，分母缩小2倍，是 ，原分数是（ ），它的分数单位是（ ）．
13、写出两个比1/5大比1/4小的分数（ ）
二、判断（对的打“√”，错的打“×”）
1．真分数小于1，假分数大于1．（ ）
2．整数都可以看成分母是l的假分数．（ ）
3．分数单位是1/10的最大真分数是 10/10 ．（ ）
4．小于7/8的真分数只有6个，大于 1 的假分数只有2个．（ ）
5．凡是分子能被分母整除的假分数，都能化成整数．（ ）
6、分数分真分数、假分数、带分数三类。
7、带分数一定大于假分数。
8、分母是6的假分数有无数个，真分数共有5个。
9、带分数大于1.
10、两个分数，分数单位大的分数较大．（ ）
11、分子、分母都是偶数的分数，一定不是最简分数．（ ）
12、分子、分母都是奇数的分数，一定是最简分数．（ ）
13、约分时，每个分数越约越小；通分时，每个分数的值越来越大．（ ）
14、异分母分数不容易直接比较大小，是因为它们的分母不同，分数单位不统一的缘故．（ ）
15、约分是每个分数单独进行的，通分是在几个分数中进行的．（ ）
16、带分数通分时，要先化成假分数．（ ）
17、假分数的倒数一定是真分数。
三、选择题
1．分子是5的假分数有（ ）个．
①3 ②4 ③5 ④6
2．当一个分数的分子是分母的倍数，这个分数实际上是（ ）．
①假分数 ②带分数 ③真分数 ④整数
3、分子和分母都是合数的分数，（ ）最简分数．
①一定是 ②一定不是 ③不一定是
4、分母是5的所有最简真分数的和是（ ）．
①2 ② ③1 ④
5、两个分数通分后的新分母是原来两个分母的乘积．原来的两个分母一定（ ）．
①都是质数 ③是相邻的自然数 ③是互质数
7、小于 而大于 的分数（ ）．
①有1个 ②有2个 ③有无数个
8、通分的作用在于使（ ）．
①分母统一，规格相同，不容易写错．
②分母统一，分数单位相同，便于比较和计算．
③分子和分母有公约数，便于约分
9、分母分别是15和20，比较它们的最简真分数的个数的结果为（ ）
①分母是15的最简真分数的个数多．
②分母是20的最简真分数的个数多．
③它们的最简真分数的个数一样多．
10、把 化成分数部分是最简真分数的带分数的方法应该是（ ）
①先约简再化成带分数．
②先化成带分数再把分数部分约简．
③都可以，结果一样．
11、一个最简真分数，分子与分母的和是15，这样的分数一共有（ ）
①1个 ②2个 ③3个 ④4个
12、假分数的分子、分母都加上1，所得的分数（ ）。
A、比原分数大 B、比原分数小 C、与原分数相等 D、不大于原分数
四、把下面的分数化成小数
五、把下面的小数化成分数。
六、求最小公倍数，最大公因数。
【篇2】好分数
好分数工具介绍
好分数APP是为使用“云校+阅卷”产品的学校的学生提供的查分看试卷的
移动应用。学生查分，查排名，查看自己的试卷等基础服务永久免费。好分数A
PP还为所有学生提供免费的大学信息，好分数APP以学生的平时考试成绩为基础
(适用于初高中学生)，通过大数据分析，预测学生凭借现在的成绩可以考上什
么样的大学或者离目标大学还差多少分，进而激励学生好好学习，为了目标大
学努力奋斗，提高成绩。
1、好分数应用中心功能强大
二、通过好分数教师可以掌握班级学生的每次考试成绩
三、查看孩子在本次考试中进步与退步情况
4、进行班级诊断，了解班级和年级以及其他班级的差距
五、最主要的是教师和孩子们可以了解学生试卷情况，并形成每个学生的错题集。形成诊
断报告，教师可以发现自己办学生那部分知识薄弱。有针对性进行补救。
【篇3】好分数
试卷类型：A
好分数新高考联合质量测评12月联考试题
高三英语
2020.12
注意事项：
1.答题前，考生务必用0.5毫米黑色签字笔将自己的姓名、座号和考生号填写在答题卡和试卷规定的位置上。
2.选择题部分，用2B铅笔把答题卡上对应题目的答案标号涂黑；如需改动，用橡皮擦干净后，再选涂其他答案标号。
3.答非选择题部分时，必须用0.5毫米黑色签字笔作答，答案必须写在答题卡各题目指定区域内相应的位置；如需改动，先划掉原来的答案，然后再写上新的答案；不能使用涂改液、胶带纸、修正带。不按以上要求作答的答案无效。
第一部分 听力（共两节，满分30分）
第一节（共5小题；每小题1.5分，满分7.5分）
听下面5段对话。每段对话后有一个小题，从题中所给的A、B、C三个选项中选出最佳选项。听完每段对话后，你都有10秒钟的时间来回答有关小题和阅读下一小题。每段对话仅读一遍。
1. What are they talking about?
A. Taking a trip. B. Spending time with family. C. Learning a foreign language.
2. What is the probable relationship between the speakers?
A. Co-workers. B. Brother and sister. C. Professor and student.
3. How does the woman feel now?
A. Relaxed. B. Excited. C. Exhausted.
4. What are the speakers probably doing?
A. Flying a kite. B. Taking a plane. C. Training for the army.
5. How much is needed to pay off the bills?
A. $200. B. $2,000. C. $20,000.
第二节（共15小题；每小题1.5分，满分22.5分）
听下面5段对话或独白。每段对话或独白后有几个小题，从题中所给的A、B、C三个选项中选出最佳选项。听每段对话或独白前，你将有时间阅读各个小题，每小题5秒钟；听完后，各小题将给出5秒钟的作答时间。每段对话或独白读两遍。
听下面一段对话，回答第6和第7两个小题。
6. What are the speakers likely to be eating on Saturday?
A. Hot pot. B. Noodles. C. Dumplings.
7. Why does the woman want to go out?
A. She won some money.
B. She hopes to show her new dress.
C.She wants to celebrate her birthday.
听下面一段对话，回答第8和第9两个小题。
8.Where does the conversation probably take place?
A. At home. B. In a library. C.At a store.
9. What does the man suggest the woman do?
A. Get a new phone.
B. Have her eyes checked.
C. Read a book before bed.
听下面一段对话，回答第10至第12三个小题。
10.What is the conversation mainly about?
A. A job position.
B. A work project.
C. Cultural differences.
11. What did the woman do in Japan?
A. She went to college.
B. She traveled around.
C. She worked for a company.
12. What does the woman think is her advantage?
A. She has worked in East Asia.
B. She can speak more than one language.
C. She has much work experience in top companies.
听下面一段对话，回答第13至第16四个小题。
13. What seems to be the problem?
A.The woman"s passport was lost.
B. The woman didn"t purchase a ticket.
C. The woman"s name was wrong on her ticket.
14. When can the woman arrive back at the gate at the latest?
A. At 10:30. B. At 10:50. C. At 11:00.
15. What does the man offer the woman?
A. A refund. B. Another flight. C. A ride.
16. Which counter does the woman need to find?
A.The check-out counter.
B. The shuttle counter.
C.The customer service counter.
听下面一段独白，回答第17至第20四个小题。
17. What should people do first if they get lost in nature during the day?
A.Look for food and water.
B. Walk as quickly as possible.
C. Find the highest place.
18. Where should people spend the night in nature?
A. At a dry and warm place.
B. At a place near a house.
C. At a place without any rocks or sticks.
19.How should people deal with a bear according to the speaker?
A. Be as quiet as possible.
B. Try making yourself frightening.
C.Throw some food on the ground near it.
20. How do most people end up getting saved?
A. Use a good map.of the area.
B. Find a river or road.
C. Set fires to attract other visitors.
第二部分 阅读（共两节，满分50分）
第一节（共15小颗：每小颗2.5分，满分37.5分）
阅读下列短文，从每题所给的A.B、C和D四个选项中选出最佳选项。
A
Our busy modem lives don"t always make it easy for us to plan healthy meals. These books
provide a guide to different types of healthy diets and plenty of recipes and hacks to keep your
cating on track.
The Blue Zones Solution
Author Dan Buettner defines Blue Zones as places in the world where people have recorded
as living the longest. The Blue Zones Solution explores diet and lifestyle techniques used in areas
like Okinawa,Japan,Sardinia,Italy,and more. Buettner explains how you can apply these to
your own daily life. There are recipes and checklists to help you create your own Blue Zone.
Food to Live By
Food to Live By takes things back to the basics. Myra Goodman,author and cofounder of
Earthbound Farm, focuses on cooking simple dishes with organic ingredients. The recipes are
easy to prepare and include important information about care and handling of ingredients.
Goodman also includes full-colored photos of her dishes.
Wildly Affordable Organic
Eating organic is a healthier choice because the food is free of pesticides and antibiotics.
Unfortunately, it can also be an expensive option. Wildly Affordable Organic gives you tricks to
eat well without the high price tag. There are tips for how to make your family"s lifestyle greener ,
save money on grocery runs, and cook easy seasonal meals.
The New Primal Blueprint,
The New Primal Blueprint is a update on author Mark Sisson"s The Primal Blueprint ,
released in 2009. It continues to focus on the benefits of eating the way our primal ancestors did
and emphasizes Sisson"s lifestyle laws for health and well-being. In addition to expanded and
updated information, the new book comes with updated photos, graphics, and cartoons.
21. What does The Blue Zones Solution mainly feature?
A. Live longer with your own recipes.
B. Live your own life to the fullest,
C. Seek recipes from long-lived people.
D. Apply book knowledge to daily life.
22. What do Food to Live By and Wildly Affordable Organic have in common?
A. They are about eating organic.
B. They are written by the same author.
C. They concerns ways of making dishes.
D. They offer full-colored photos of dishes.
23. What is special about The New Primal Blueprint?
A. It focuses on health.
B. It contains good photos.
C. It emphasizes lifestyles.
D. It is an updated version.
B
I received my autoimmune disease diagnosis(自身免疫疾病诊断） in 2009, and for the
first few months , I was in a very bad place. I was suffering from severe anxiety and panic attacks
on a daily basis. I was no longer able to function as a “normal" person. During that time , all I
could do at best was to move about the house trying to accomplish a few chores, and prepare
meals.
After a few months on the Paleo Autoimmune Protocol, my intense tiredness improved and
I slowly regained some energy. That is when I tried to follow my doctor"s advice to exercise.
I clearly remember my first attempt. I was still weak, but somehow,I thought that if I
could push through and pretend I had a normal life that things would get better.So,I went out
and started running in the little neighborhood park. Unfortunately,I didn"t last even five minutes
and came back home, totally crashed. It took me several days to recover. After that first brush
with exercise,I understood that I would have to start slow. I began going on daily walks with my
husband around the block. Slowly, we went further and further, and my strength came back
progressively.
After walking,I started to altend yoga classes. I remember barely making it through my
first class. My muscles were weak and trembling by the time I rolled up my mat. But I was also
so happy to be able to get out of the house, mix with other people and have a social life!
After yoga, I ventured into activities a little bit more strenuous, but still gentle on the
joints.I was going to the swimming pool to do laps and riding my bike. Recently,after almost
four years on the Paleo Autoimmune Protocol,I was finally able to really up my game and start
exercising regularly with a personal trainer.
24. How did the author feel in the first few months after the diagnosis?
A. Confused. B. Impatient. C. Disappointed. D. Panicked.
25.What may the author learn from her first attempt to exercise?
A. Darkest hour is just before the dawn.
B. Hard work never did anyone any harm.
C. The longest way about is the nearest way home.
D. A journey of a thousand miles begins with a single step.
26. What was the first yoga class like?
A. Fun but helpless.
B. Tiring but rewarding.
C. Refreshing but exhausting.
D. Relaxing but disappointing.
27.What can we know from the author"s experience?
A. Exercising contributes to good health.
B. Mood plays a vital role in one"s recovery.
C. Doctor"s advice should be strictly followed.
D. Connecting with people barely makes difference.
C
It is said that everything his brush touched tuned to gold. But in truth, the value of his
work could be worth more than any precious metal. Spanish artist Pablo Picasso(1881-1973),
one of the greatest artists of the 20th century,painted two of the world"s 10 most expensive
paintings,according to the Guardian.
Between 1907 and 1913,Picasso and his colleague Georges Braque (1882-1963) started
a revolution in painting. Before that,paintings were like windows-they were painted to look as
if they had depth.You could tell which objects were "close" to you and which objects were"far
away", as if the picture were a window you were looking through.But Picasso and Braque didn"t
want to paint like that anymore. To them,a painting was marks and lines on a flat surface. They
thought a guitar can look very different depending on which angle one looks at it from, so they
broke the guitar up into pieces. It was an analytical approach to art that gave this style of
painting its name: analytic cubism.
But why did they feel such a need to change things? Science was turning people"s ideas
upside down.German-born physicist Albert Einstein"s theory of relativity was proving that what
we knew about time and space was wrong.It"s often said that Picasso was like Einstein wearing a
painter"s clothing. And it was not only science that was making waves. New political movements
were on the rise. The world was becoming different, artists needed to start seeing and painting it
differently.
The famous and terrifying painting Guernica (1937) shows the horror of the bombing of the
town of Guernica during the Spanish Civil War (1936-1939). In the painting, you can
actually see the sky falling. Picasso couldn"t have painted it without the skills he learned during
his cubist period. Breaking a guitar into pieces was his preparation for showing the world being
blown to pieces.
28. What can we know about Picasso from paragraph 1?
A. His brush has magic.
B. His works are highly valued.
C. His contribution is over-recognized.
D. His paintings are the most expensive.
29. What does paragraph 2 mainly talk about?
A. The feature of Picasso"s paintings.
B.The background of Picasso.
C. The cultural meaning of cubism.
D. The advance of painting techniques.
30.What contributed to Picasso"s way of painting according to paragraph 3?
A. Einstein"s theory.
B. The changing world.
C. The skills he learned.
D. The pressure from his colleagues.
31. What"s the purpose of the text?
A. To show the development of art.
B. To honor one of the greatest painters.
C. To argue for Picasso"s way of painting.
D. To compare Picasso"s paintings with those before.
D
A study has found that people who are literate had a third the risk of developing dementia
（痴呆症）compared with those who had never learnt to read and write. The scientists behind
the study suggested that learning to read may reveal new intellectual worlds and promote a life of the mind that might help to keep brains sharp into old age.
＂If one acquires the ability to read and write, that opens up opportunities to engage in
cognitively stimulating activities,"Miguel Arce Rentería,from Columbia University Medical
Centre,said."Even with low education,you can read newspapers and books. That provides
opportunities for constant stimulation that can last for the rest of your life. Maybe that might
confer protection and reduce the effects of dementia."
The research published in the journal Neurology, looked at almost 1,000 older people in
New York, chosen because they had received little education as children.The average age was
77 and more than 90 percent were immigrants. All of them had had four years or less of
education,with about a quarter describing themselves as illiterate.
Among those who did not read,35 percent had dementia at the start of the study,
increasing to 48 percent four years later. Among the literate respondents, 18 percent had
dementia at the outset, rising to 27 percent. After adjusting for social class, age and other risk
factors,the scientists calculated that illiterate people were three times more likely to have
dementia. They were also twice as likely to contract it over the four years of the investigation.
It is impossible to say for certain that the link means that literacy delays dementia. It may
be that people who managed to get a better education before arriving in the US were also
different in other ways.However,Dr Arce Rentería said:"What this provides is strong evidence
for a pretty strong link."
32. What is the finding of the study?
A. Dementia slows people"s reading.
B. Dementia can be cured by reading.
C. Literacy may sharpen our minds.
D. Literacy makes dementia less likely.
33. What does Miguel Arce Rentería stress?
A. The procedure of the study.
B. The importance of education.
C. The reasons for the findings.
D. The requirements for the research.
34. Which of the following can replace the word “outset"” underlined in paragraph 4?
A. Interval. B. Core. C. Beginning. D. End.
35. How did the researchers draw the conclusion?
A. By carrying out tests.
B. By making a comparison.
C. By working on an assumption.
D. By analyzing different answers.
第二节（共5小题；每小题2.5分，满分12.5分）
阅读下面短文，从短文后的选项中选出可以填入空白处的最佳选项。选项中有两项为多余选项。
How to Be a Successful Team Leader?
Every well-organized team needs to have an outstanding leader with specific skills.
Sometimes the leader"s abilities can come to affect the whole team. Although you students are
still young, it"s never too early to cultivate leadership skills.
A team consists of both leaders and followers. 36 What is essential to the role of leader
is the ability to unite the whole team. A great leader enables their team to achieve a common
goal through the giving of clear directions and support. Meanwhile,everyone on a team also
desires personal success, so a balance can be hard to strike. A leader should have fierce
determination. 37
What"s more, a successful and charming leader ought to be able to handle interpersonal
relationships well. They should be honest, fair, objective and impartial(公正的） when it
comes to both rewards and punishments. 38 And in so being,the working atmosphere will
only come to be improved.
39 Good communication skills allow people to build good relationships, which is an
essential part of being a good leader. If you find it hard to express your ideas clearly to those
who you cooperate with, it may be rather difficult for you to be a good leader. Positive thinking
will make it easier for leaders to become effective speakers and communicators. Listening and
observing carefully is also of great importance,and a good leader knows how to listen effectively
when communicating with others.
It"s a well-known fact that, whatever field you wish to work in,leadership skills are necessary for anyone who desires to have a successful career. 40
A. These kinds of leaders are trustworthy.
B. Followers are different from leaders , though.
C. Leaders still need someone to guide them along the way.
D. Neither side can exist and work effectively without the other.
E. So it"s never too early to train yourselves as promising future leaders.
F. To be a leader, you should take the initiative in connecting with your fellow students.
G. Otherwise,the followers will lose their confidence and things will not be done well.
第三部分 语言运用（共两节，满分30分）
第一节（共15小题；每小题1分，满分15分）
阅读下面短文，从每题所给的A、B、C、D四个选项中选出可以填入空白处的最佳选项。
In storm-ravaged Santa Clarita, California, last March, Margarito Martinez approached
Runner Road carefully. A 41 stream had flooded it. Martinez,driving a Toyota SUV, 42 he"d be OK, but it 43 a big mistake.
Halfway 44 , the rushing water grabbed hold of his vehicle, 45 it off the road and
washing it down a rocky streambed. lt finally stopped a good 80 feet away, when the water
46 lifted the SUV and wedged it in the ground at a 45-degree angle.Injured, 47 , and trapped inside with the muddy water 48 quickly.
On the road right behind Martinez were a delivery worker and his niece. They watched the
horror 49 , and when Martinez"s SUV came to a(n) 50 in the middle of the stream, the
man leaped to act. First, he grabbed heavy-duty ropes from the back of his van and 51 the
swinging SUV to nearby posts. Then he climbed to the top of the SUV and banged on a back
52 with his fists, but 53 . Frustrated, he turned to his niece and yelled,"Give me a rock!" Over and over he smashed the rock into the window.
54 , the glass broke and the man kicked in the remaining glass. Soon, a soaked Martinez 55 through the window frame,and the men escaped to dry land.
41
A.swollen
B. broken
C. deserted
D. constructed
42
A. wondered
B. valued
C. proposed
D. figured
43
A. stuck to
B. turned out
C. made
D. avoided
44
A. across
B. over
C. down
D. through
45
A. clearing
B. stretching
C. cutting
D. sweeping
46
A. anyhowt
B. anyway
C. somehow
D. somewhat
47
A. shaken
B. confused
C. relieved
D. suspected
48
A. falling
B. rising
C. disappearing
D. lowering
49
A. fade
B. unfold
C. cease
D. react
50
A. end
B. pause
C. agreement
D. rest
51
A. linked
B.exposed
C. secured
D. restored
52
A. seat
B. mirror
C. wheel
D. window
53
A. in control
B. in turn
C. in vain
D. in effect
54
A. Obviously
B. Ultimately
C. Frequently
D. Precisely
55
A. emerged
B. extended
C. released
D. surfed
第二节（共10小题；每小题1.5分，满分15分）
阅读下面短文，在空白处填入1个适当的单词或括号内单词的正确形式。
Kirby purchased a sofa last month at the Habitat for Humanity ReStore in Owosso , Michigan, but said it 56 (feel) odd and uncomfortable. His daughter, 57 (urge) by curiosity, eventually unzipped the cushion to examine it further and discovered stacks of hundred-dollar bills. A total of $43,170 was found inside the sofa, but Kirby didn"t feel 58 （moral) right keeping it. He went back to the store 59 (seek) out the original owner and tell them about the cash.
Kim Fauth-Newberry came into 60(possess) of the sofa after her grandfather, the original owner, passed away last year. She said she had no idea there was money inside when she gave it away. The ReStore surprised her on Thursday by calling her down to the shop and 61 (return) every last dollar that Kirby had found.
Rick Merling, store manager, praised Kirby for leading by example and putting other"s needs 62 his own.
Kirby claimed he could have used the money for 63 new roof but was happy the cash
had found 64 (it) way back to the original owner. “ In spite of what I am going through and
in spite of my own needs, l"m just going to do the right thing, 65 makes me feel good. ”
Kirby said.
第四部分 写作（共两节，满分40分）
第一节（满分15分）
假如你是李华，你负责组织你校将要举行的英文诗歌创作大赛，去外教Larry的办公室与他商量有关事宜，恰好他不在。请你给他写一张留言条，内容包括：
1. 来他办公室的原因；
2. 要商量的具体事宜；
3. 再约时间和地点。
注意：
1. 写作词数应为80左右；
2. 请按如下格式在答题卡的相应位置作答。
第二节（满分25分）
阅读下面材料，根据其内容和所给段落开头语续写两段，使之构成一篇完整的短文。
This past summer, I joined my sister"s family for their annual Adirondack vacation in a rented
cottage on a lake, the same place my family has stayed since I was a little kid. There are plenty of
activities to keep everyone busy: swimming, fishing and sand castle building on the beach.
By the third day, I had noticed that my ten-year-old niece, Jannie, had spent most of her
time watching cable TV and browsing through the gift shops in town. Not exactly the wilderness
experience I remembered from my youth. So, at dinner, I told Jannie we should hike to the top
of the mountain across the lake the following morning, which was called Rocky Point because
the peak is bare and rock-covered.
＂Well.”replied Jannie,"Tomorrow there are some shows on the Disney Channel, so I"m
going to be pretty busy. "
＂When your mother and I used to come here when we were your age. We were too busy
swimming and hiking up mountains.”
＂Sounds more like punishment than a vacation."She shrugged her shoulders.“Besides,I
don"t think I can walk that far.”
When I said it only took a half-hour of steady walking to get to the top. She grumbled, "Fine,
I"ll go. ”I knew she was agreeing just to shut me up, but I would take anything I could get.
The next morning was a perfect day for a hike, with sunshine and clear skies. I got up
early and took some sandwiches and water bottles, which I tucked into my backpack along with
the bug spray and the camera.
Jannie came shuffling downstairs, sighed dramatically, rolled her eyes and announced in a
very unenthusiastic, robot-like voice.“I"m ready to go hiking, Uncle David."Anyway, we
climbed into my car and drove to the trailhead about ten minutes away. As we stood at the edge
of the parking lot and looked down the shaded trail that led into the woods. "I still not sure this
is a good idea, but if you and Mom could do it,I can too, I guess.”
注意：
1.续写词数应为150左右；
2.请按如下格式在答题卡的相应位置作答。
【篇4】好分数
如何教学生玩好分数
我们都知道一年级认识数“1”的时候，只讲一只萝卜是“1”，不讲一筐萝卜是“1”。三年级看到三筐萝卜还不知用“筐”来回答，五年级老师教了才明白。教育是为了满足学生对数的要求，要顺其自然，而不是为了构建严密的学科课程体系。因此，“单位1”的概念不能过早地揭示，但“1”是重要的计数单位，是学生熟悉的，而分数，从本质上来说是表示两数相除的结果，使得四则运算及其法则畅通无阻；在生活中，分数主要是表示部分与整体的关系，由此引入思考。
一、教儿子得出的尝试（分数是玩出来的）
一天，孩子他爸到商场买凉席，到了柜台，遇到麻烦，于是给儿子打电话，叫儿子找把尺子量一量床的长度。儿子在家找来找去就是找不到尺子，怎么办？儿子正在看五年级的分数，妈妈在洗衣服……爸爸问儿子：“你今天系皮带了吗？”妈妈说：“儿子，你将皮带拿下来量一量床的长度。”儿子取出皮带一量，床正好是皮带长度的2倍，儿子给他爸爸回了电话，他爸爸又要他再量一下沙发的长度。儿子再用这根皮带去量沙发。唉，沙发没有皮带长。我该怎么办？儿子正在预习分数，他妈妈提示他，那你就看书给你爸爸回答。儿子意识到了爸妈的用意，但又不知怎样创造出分数来？儿子左思右想，又把书读了一遍，还是没得要领。妈妈提醒儿子，你在幼儿班学过折纸，现在再折一次看一看。儿子从中悟出了折纸的办法！于是儿子把皮带对折来量，唉，真不巧，沙发比对折后的皮带长一些；儿子再想办法将皮带再折量了三次还是多一些。儿子把皮带再折一量，巧啦，沙发正好有7个这么长，儿子真高兴，可是，他再一次遇到了困难。现在如何跟爸爸说沙发是多少个皮带长？
妈妈在一旁提醒他：“你把答案写在练习纸上，你把一根皮带对折了几次，平均分成了几份？”儿子一时间无语。是3份、6份还是8份？现在又遇到了麻烦，有办法吗？妈妈一边解皮带一边说：“人如果没有皮带呢？你能不能把折纸在折同样的次数后再数有多少个块儿？”停留了片刻，儿子动手尝试着再折，一会儿，惊讶地说：“啊！8份。”妈妈问：“那沙发是多少个皮带长？”儿子答：“沙发是7/8皮带长。”妈妈说：“还有不同答案吗？”儿子说：“还有7个1/8。”妈妈说：“因为7个1/8加起来之后，分母不变，就是分子相加起来，7个1就是7，所以是7/8。这就是说7个1/8就是7/8。所以两个回答都对。”
【篇5】好分数
个性化教学辅导教案任课教师：余老师 授课时间： 年 月 日（星期六 ） 14： 00-16： 00
分数的意义和性质、分数加减法 ”易错题集锦
、填空题
把 3 米平均分成 4 份，每份占 1 米的（），是（）米。
8、把下面各数中的带分数化成假分数，假分数化成带分数。
15、把 5/10、3/10 和 5/8 按照从小到大的顺序排列为（ ）。
16、六（ 1）班种树 56 棵，五（ 1）班种树 40 棵，六（ 1）班种的棵树是五（
班种的棵树是六（ 1）班的（）。
17、一堆煤平均分 7 次运完，每次运这堆煤的
18、小红从学校到图书馆要步行 32 分，小青从学校到图书馆要步行 35 分，小红每分步行这段路程 的（），（ ）步行的速度慢一些。
19、一台碾米机 30 分碾米 50 千克，平均每分碾米（ ）千克，照这样算，碾 1 千克米要（ ）
分。
件。（ ）的工效最高。
25、在 ○内填 ＞、 ＜或=。
2○2
5○3
16○ 34
1○ 26
22○
31
79
85
4 53
55
7
8
26、分母是
a的 8 大真分数是（
），最小假分数是（ ）。
27、分子是 10 的最大假分数是（ ），最小假分数是（
28、把 4吨煤平均分给 5 户居民，平均每户居民分得总吨数的
29．甲车 3 小时行 441 公里，乙车每小时行 130 公里，（ ）速度快一些。
30．小明看一本书要 8 天看完，小强看同样的一本书需要 10 天看完，二人都看了 4 天，小明剩下 全书的（ ），小强剩下全书的（ ）。
3
31．五年级一班女生人数是男生人数的 ，（ ）的人数表示单位 “1”的量。实际就是把（ ）
5 的人数平均分成（ ）份，女生人数相当于其中的（ ）。
二、选择题
1．有一个正方形，边长是 2 厘米，如果把它的边长都扩大 2 倍，原来正方形的周长是边长扩大后 正方形周长的（ ），原来正方形面积是边长扩大后正方形面积的（ ）。
① 1倍②2倍 ③3倍 ④4倍
2．一个分数的他子扩大 3 倍，分母不变，这个分数就（ ）；若分子不变，分母扩大 3 倍这个 分数就（ ）。
①扩大 3倍②扩大 2倍 ③缩小 3倍④缩小 2 倍
3． 0．3分钟是 40 秒的几分之几（ ）。
9 3 19
① 9 ② 3 ③ 19
20 40 60
4．根据分数与除法的关系确定：分子相当于除法中的（ ），分数值相当于除法中的（ ）。
①被除数②除数 ③商
5．分母是 6 的最简真分数有（ ）。
①6个 ②5个 ③4个 ④3个 ⑤2个 ⑥1个
6．分子除以分母商 1 余 1。这个分数是（ ）。
①真分数 ②假分数 ③最简分数
7．分子是最小的质数，分母是 2，这个分数是（ ）。
①真分数 ②假分数 ③最简分数
8．某班男生 21人，女生 24 人，男生人数是女生人数的 （ ），男生人数是全班人数的 （ ）。
1 7 21
① 1 ② 1 ③ 7 ④ 21
4 15 24
9．分母是最大的一位数，分子是最小的合数，这个分数改写成小数是（ ）。
①0.4 ②0.4 ③0.40 ④ 0.444
10．把 4米长的电线，平均截成 6 段，每段长（ ），每段占电线总长的（ ）。
4 1 1 1 1
① 米 ② ③ ④ ⑤ 米
10 4 6 10 10
10.分母是 10 的最简真分数的和（ ）
A、1 B、2 C、3 D、2
11.— 分母加上 9，要使分数的大小不变，分子应加上（ ）
A、6 B、4 C、8 D、9
12.5 克盐溶入 75 克水中，盐占盐水的（ ）
1 1 2
A 、 B 、 C、 D 、无法确定
20 15 25
13
13.大于 1 而小于 3 的分数有（ ）。
44
A 、一个 B、无数个 C、有限的 D 、没有
三、判断题
1 ．分数的分子和分母都不能是 0。（ ）
2．两个分数相比较，只要分数单位大的这个分数值就大。（ ）
3．分数的分子和分母同时乘以任何数，分数大小都不变。（ ）
4．假分数都比真分数大。（ ）
5．因为任何带分数都能化成假分数，所以任何假分数都能化成带分数。（ ）
6 ． 7 小时就是 日。（ ）
7．把 2 化成小数是 2.875 。（ ）
8．16千克黄豆可以做 56千克豆腐，每千克豆腐需要用 3 千克黄豆。（ ）
9．一个三角形，其中一个内角度数占三个内角度数和的，这个三角形肯定是直角三角形。（ ）
10.分子比分母小的分数是最简分数。（ ）
12
11.4 千克的 与 2 千克的 相等。（ ） 55
12.分数都比 1 小。（ ）
13.8和 12的大小相等，它们的分数单位也相等。（ ）
8 12
四、综合运用
17
1、学校食堂第一周烧煤 吨，第二周烧煤 0.65 吨。哪周节约？
20
2、三位小伙伴进行比赛，小林 3 分走 182 米，小军 4 分走 245 米，小宋 5 分走 306 米。他们谁走 得快？
7 3 2
3. 一条路长 千米三天修完 ,第一天修了全长的 ,第二天修了全长的 ,第三天要修全长的几分之
8 8 5
几?
7 3 2
4. 一条路长 7 千米三天修完 ,第一天修了 3千米,第二天修了 2 千米,第三天要修几分之几千米 ?
8 8 5
5.少先队员采集树种。第一小队 7 人采集了 8 千克，第二小队 6 人采集了 7 千克。哪个小队平均每
人采集得多？
6. 一堆货物 120 吨，用去了 45 吨，还剩总数的几分之几？
课后 作 业 ; 巩 固 复 习 ;
巩固 预习布置
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