2022 fourth grade mathematics next semester summer homework answer.
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1. The students planted trees on one side of a 200-meter-long path, one at every 4 meters (both ends). How many seedlings does a * * * need?
Analysis: The key to this problem is to plant a tree at the starting point, and then walk 4 meters to carry a tree. There are 50 4 trees in 200 miles, so ***5 1 tree. Teachers can use this question to ask whether there are no seeds at both ends, or think about climbing stairs and chopping wood, and sum up their similarities and differences. (If trees are planted at both ends, add1; If no trees are planted at both ends,1should be subtracted; If you plant trees at one end, you should add and subtract. )
Formula: 200÷4+ 1=5 1
2. The distance between the two buildings is 60m, and a pine tree is planted every 5m. How many trees can be planted between two buildings? Analysis: The 1 question on this question is similar, and it belongs to the kind where no trees are planted on both sides. 1 title plus 1, minus 1 title.
Formula: 60÷5- 1= 13.
3, a square, if you add 6 cm to its adjacent side, you can get a new square, and the area of the new square is larger than the original square 120 square cm. Find the area of the original square.
Analysis: This question should be combined with graphics to help children understand. The added part is a rectangle with a width of 6 and a length of 6+ positive side. Therefore, to ask for the area of the original square, we must find the side length of the square, and only ask for the length of the added rectangle.
Formula:120 ÷ 6-6 =14; 14× 14= 196。
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1, with serial numbers: 2, 5, 8, 1 1, 14,? According to the above arrangement, do you know the number 1995?
Analysis: the difference between two numbers is 3, and the first number is: 3×1-1= 2; The second number is 3×2- 1=5. What is the number? It is three times less than 1.
Formula: Solution: ∫ 2+3 = 55+3 = 88+3 =111+3 =14.
So: the nth =3N- 1.
∴3× 1995- 1=5984
2. There is a triangular land with three sides of 120m, 150m and 80m respectively. Plant a tree every 10 meter at the boundary. How many trees can you plant at most?
Analysis: Triangle is a closed figure, that is, the starting point is also the end point, so we can understand it as a problem of planting trees. Formula: (120+150+80)/10 = 35.
3. There are 144 young pioneers practicing in a row, and 12 people in a phalanx. Do you know how many young pioneers are standing around this square?
Analysis: A square has four sides, 12 people have 1 sides, so it is 4×12; There are four corners, so subtract: (1×4).
Formula: (12×4)-( 1×4)
=48-4=44 (person)
The mother is 32 years older than her son this year. Three years later, the mother is five times older than her son. How old is her son this year?
Analysis: Follow the trend and guide children to start with the problem. If you want to ask your son how old he is this year, you should first ask his son three years ago and ask him if he knows his mother three years ago.
Formula: 32+3 = 35; 35÷5=7; 7+3= 10。
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1 has three natural numbers, and the results obtained by adding or multiplying them are all the same. What are these three numbers? Analysis: These three numbers are 1, 2 and 3 respectively.
2. The quotient of two natural numbers is 47 and the remainder is 3. The sum of dividend, divisor, quotient and remainder is equal to 629. Do you know what the divisor is?
Analysis: According to the two sentences in the question, 629- remainder-quotient = dividend+divisor; Because dividend-remainder =47 divisors; So you can find the divisor.
Formula: 629-47-3 = 579; (579-3)/48= 12
3. Two natural numbers are subtracted, and the sum of the minuend, the minuend and the difference is 360. Can you find out what a minuet is according to what you have learned?
Analysis: Because: minuend+subtraction+difference =360, minuend = subtraction+difference. So: there are two minuets in 360 degrees. Formula: 360/2= 180
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1. In order to praise good people and deeds, Teacher Zhang wants to investigate who did good deeds. He called Xiao Ming, Xiao Gang and Xiao Hua for questioning. Ming said: Xiao Gang did it. Xiaogang said: I didn't do it. Xiaohua said: I didn't do it. Knowing that only one of the three of them told the truth, he asked: Who did this?
Analysis: There are only three cases of this problem, one is done by Xiao Ming, the other is done by Xiao Gang, and the third is done by Xiaohua. Exclusion can be used. If Xiao Ming did it, then Xiao Ming lied, Xiao Gang told the truth, and Xiao Hua told the truth, which contradicted the condition of "only one person told the truth" in the question, so Xiao Ming didn't do it; If Xiao Gang did something good, then Xiao Ming told the truth and Xiao Hua told the truth, which contradicted the condition of "only one person told the truth" in the title, so Xiao Gang didn't do it. If Xiaohua did it, then only Xiaogang is telling the truth. This situation still exists.
Format: Xiaohua did this good thing.
2. If the width of a rectangle is increased by 2cm or the length is increased by 3cm, their areas will all increase by120cm2. What was the area of the original rectangle?
Analysis: If you want the area of the original rectangle, first ask its length and width. It can be known from the figure that its length is equal to 120/2 and its width is 120/3.
Formula:120/2 = 60; 120/3=40; 60×40=2400。
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1, 100 people 200 steamed buns, 4 adults, children 1, and the rest 1. How many adults and children are there?
Analysis: Suppose 100 people are adults and eat 400 steamed buns, which is 400- 199=20 1. And every time children are treated as adults, they will eat three more steamed buns, so 20 1/3=67 children are treated as adults. Then adults are 100-67=33. The formula is: (4×100-199)/(4-1) = 67.
100-67=33
Of course, it can also be assumed that this 100 person is a child. The logic is the same. You can have a try.
2. A math test paper consists of 24 questions. Deduct 7 points for a correct answer and 5 points for a wrong answer. A student answered 24 questions, but the total score was zero. Do you know how many questions he answered correctly? Suppose the students answered all the questions correctly.
Then score: 24 times 7= 168 (points)
Actually, I got zero, but I was missing: 168-0= 168 (points).
Answering a wrong question not only won't add points, but also will deduct 5 points, so you will lose money if you answer a wrong question: 7+5= 12 (points).
The wrong question is: 168÷(7+5)= 14 (Tao). The correct question is: 24- 14= 10 (Tao).
Primary school students' summer vacation life study plan
1. Get up at 6: 30 in the morning, and spend 5 to 10 minutes quietly doing small-scale exercises at home, such as squats and chest expansion (which will help the brain wake up quickly).
2. During class (I don't know how long it will take for the landlord to attend class, so I won't write). If it is Thursday, I will do my homework for three hours (of course, I will have a rest in the middle), because my study efficiency is high in the morning. Eat at noon. Watch TV 1 hour (watch after eating)
3. Sleep, 2 hours, you should sleep first, because you have just eaten and watched TV, and you are so tired in the morning. ...
4. Play computer games in the afternoon, because online games are generally crowded in the afternoon and there are many activities, so playing computer games every afternoon is no more than 2 hours (because foreign experts have studied that if a person receives computer radiation for more than 2 hours every day, it will affect his intelligence! Especially minors! ! Remember! ! )
It's almost 5 o'clock after finishing the computer. I have been doing eye exercises, reading books and watching meals. Setting a stool, cleaning the table and doing some housework at home will help you gain an advantage in junior high school (most teachers choose competent class cadres and assistants, and of course housework is also for parents).
6. Watching TV, there is a lot of good news in the evening, news broadcast, cross-strait broadcast, global broadcast and so on. Besides, the Yongle Hui of CCTV 2 and the entertainment programs of CCTV 3 are also good.
7. Wash dishes
Go to the library from Monday to Friday (no computer)
Self-arrangement on Sunday: mainly to adjust the mentality.
First of all, correct children's concept of holidays, and don't let children think that holidays can make them work irregularly, stay awake and indulge in games and networks. Reasonable arrangement of holiday time, ensuring moderate sleep and avoiding children's long-term addiction to TV or computer are the first problems that parents should pay attention to during their children's holidays.
Generally speaking, teenagers should sleep for about 8 hours. The younger they are, the longer they need to sleep. Children under 10 should sleep for 9- 10 hours. Children are at home on holiday, and there is no strict time limit for going to school the next day, so it is inevitable to stay up late. However, for the sake of children's health, parents should control according to the situation to avoid the situation of "getting more and more tired".
Secondly, encourage children to go out of the house. Take part in outdoor activities and help with simple housework at home. Children are usually busy with schoolwork and have less exercise time. It is difficult to meet the needs of physical and mental health only by going to physical education class twice a week. Although it is difficult to insist on outdoor sports alone in the hot summer vacation, there are many exercise methods to choose from, such as skipping rope, kicking shuttlecock, badminton, table tennis and basketball. If the space and conditions are really limited, climbing stairs is also a good choice. It is recommended to arrange 30-60 minutes of moderate and low intensity exercise every day. It is very helpful for children's growth.
As for housework, arranging some simple housework for children every day can not only reduce the burden on parents, but also make children feel their importance to the family and increase their sense of adulthood and accomplishment.
Once again, please be sure to carefully choose extracurricular remedial classes, respect children's wishes, and don't do useless work. Parents are eager for their children to succeed, but they are also worried that their children will fall behind others. They often enroll their children in several kinds of cram schools at the same time, so that they can bear another kind of burden before they have adjusted and rested well. It's no use doing so. As mentioned above, when my children realized the importance of English in the winter vacation of grade two, I gave them a pass to study abroad, along with New Concept English and some story readers. After that, the study time is controlled by the children themselves. The effect is surprisingly good, and the child is willing to learn: he happily asked how to say everything at home in English; I like to point with the pen of FLTRP on all the papers, screens and walls with words. I will learn new concept English by time every day and practice my pronunciation with the sound of my pen. Then, as I said, I became an English class representative, hehe. Now the children's English is among the best in the class.
Therefore, holiday study should start from children's interests, and we must respect children's interests and ideas to avoid giving them too much pressure.
Finally, emphasize. Parents should not impose their wishes on their children. Whether parents give control of holidays to their children depends on their self-awareness and self-care ability. The study and living arrangements I gave you for the summer vacation should be adjusted according to the children themselves. I'm also constantly adjusting.
Summer diary
It is raining.
After getting up today, my grandmother and I went to buy breakfast. As soon as I saw it was going to rain, my grandmother dragged me all the way to my uncle's house.
Hardly had we finished eating when it began to rain lightly. After dinner, the rain stopped a little. We played and watched TV for a while, and it began to rain again. ...
At noon, after dinner, we went to the children's playground. We rode a wooden horse, and it rained heavily, so we had to take shelter at the door and wait and wait. The rain finally stopped and we went home.
My sister woke up, watched TV for a while, then played for a while, and then had dinner.
After we finished eating and playing for a while, my uncle got off work. We watched TV for a while, and then went to bed.
Do a good deed
Today, we go to Dongguan to play. There was a heavy rain when I came back, which filled our platform with water. Teachers find it inconvenient to get in and out. When Lily and I were playing a water race, I thought of a way to clear the sewer. Soon, the water ran away.
Then, when I got home, my mother saw that I was all wet. My mother picked up the hanger and tried to hit me, so I ran away. My mother chased me down and I hid. My mother couldn't find me, so she went to teacher Yan Mei's house. Later, my mother came back and told me that Teacher Ye praised me for doing a good job in dredging waterways and asked me to write it down.
Through today's things, I understand that it is sometimes hard to do a good job, but all the efforts and efforts are worthwhile.
Housekeeping day
Oh, what bad luck! My parents are on a business trip tonight, and I am the only one at home. Although he is not young, he is born timid. Every night, my parents need someone to accompany them, otherwise I will be like a "little tail", and I will follow them wherever they go. There's really nothing I can do today. They all agreed that they couldn't take me with them. I should go to exercise. In a rage, I announced that I would stand on my own feet from today and never rely on them again. Seeing that I was so proud, my parents smiled at each other, charged some precautions, closed the door and left.
God forbid, it happened that there was a strong wind today and the doors and windows kept ringing. I became more and more afraid. I thought of the ghosts and horrible villains in the movie. I feel my heart beating violently, as if he were shouting, "relax, I'm going to jump out!" " "The brain is also protesting:" Don't think so much, I'm going to have a car accident here! " "I was not in the mood to do my homework, so I went to the living room, turned on the TV, turned it on very loudly, and sat on the sofa watching TV. Although my eyes are fixed on the TV, my ears are alert to what is happening outside. I simply covered my ears and said to myself, "I'm not afraid, just not afraid!" " "I watched the time go by and hoped my parents would come back soon.
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