Fifth grade math story

Now, our math class is solving practical problems of two-step calculation.

Today is Sunday, and our family went to Tianmu Lake to play. On the way to Tianmu Lake, I thought of such a problem.

When the bus reached the first stop, I saw 8 people got on the bus, and 3 people got on the second stop. Then if the number of people getting on the bus at the third stop is the same as the first stop and the second stop If the number of people at the third station is twice that of the station, how many people will be on the third station at once?

Children, can you solve this problem? Let’s try it with the knowledge we have learned.

Children, can you solve this problem?

8.<24-hour time telling method>

The 24-hour time telling method is really omnipotent. If you don’t believe it, just take a look at how I spend my weekend:: First, 7:30 Get up, then wash your face from 7:45---8:00, have breakfast from 8:00---8:15, do homework from 8:15---9:15, watch TV from 9:15---10:30, 10:30---11:00 for lunch, 11:00---15:00 for a nap, 15:00---16:00 for play, 16:00---17:30 for watching cartoons, 17: Eat dinner from 30---18:00, watch TV from 18:00--20:00, play on the computer from 20:00--21:00, go to bed at 21:00. Isn't the 24-hour timekeeping method great? If you have such thoughts, you must write a diary like this!

9. A little adds up to a lot

This afternoon, my mother and I went to the supermarket to buy things.

When we bought what we needed and were about to leave, I saw ham on the shelf, so I asked my mother to buy some ham, and my mother agreed. But just after taking a few steps, I saw packages on the shelf again, of the same brand, same weight, containing 10 sticks, priced at 4.30 yuan per package. Should I buy a pack or a stick? I hesitated. Suddenly, my mind turned around, I just need to compare and buy whichever one is more cost-effective.

So I started to calculate: if I buy 10 pieces at retail, each piece costs 4 jiao, which is 40 jiao, which is equal to 4 yuan, and the whole package costs 4.30 yuan, which is 3 cents more, so I decided to buy it in bulk. I told my mother my calculation process, and she praised me for loving to use my brain.

Mathematics Newspaper

Today, we issued another Mathematics Newspaper for primary school students. This issue of the newspaper is really exciting.

The above talks about how to let the fragrance of books accompany you, how Mao Yisheng worked hard to practice memory, the origin of Arabic numerals and other mathematical knowledge. Turn over and there are many mathematical tips, such as: how to find rules, how to remember knowledge, and there are some mathematical stories on the other side, from which I gained a lot of content that I couldn't learn in class.

So, I feel that every time I read Mathematics Journal, I can master more knowledge. I like it very much.

"The Mystery of Mathematics" Hutangqiao Central Primary School Zhang Na

Mathematics is everywhere in our lives. For example: How much does it cost to buy vegetables at the wet market? How much does it cost to buy something in the supermarket per day? ...Also, once you know kilograms and grams, you can calculate the prices of weighing things yourself. So, isn't mathematics important?

So, I want to remind you--you must learn mathematics well!

Mathematics is very mysterious. It can let us know some unknown numbers. Therefore, some children find mathematics a bit difficult and sometimes have to ask for tutoring.

But mathematics is also very flexible. In addition to what I just mentioned, there are many kinds of mathematics in life!

"Baby Tintin Memorizes the Rhythm"

On Sunday, Baby Tintin was reciting the formula, but when he got to "38", he stopped.

At this time, my sister happened to come over, and Ding Ding quickly asked: "Excuse me: 38?..."

My sister said angrily: "You are only '38'! Not yet" I learned to curse at an early age!"

My mother, who was cooking in the kitchen, heard the sound and replied: "It's Women's Day."

I laughed secretly on the sidelines. In fact, they all misunderstood: Ding Ding was neither cursing nor remembering festivals, but reciting formulas:)

Haha... …..

《Compare, who uses more units? 》

In the morning, I got up from the bed, which was about 2 meters long;

Picked up a toothbrush about 6 centimeters long and started brushing my teeth;

Then, took Pick up a towel 40 cm long and 20 cm wide and start washing your face.

After washing, I took a bowl weighing about 100 grams and filled it with porridge;

After eating, I came to school carrying a schoolbag weighing about 2 kilograms and started After the two classes, we all stood under the flag pole about 7 meters high to do exercises.

Okay, that’s all I have to say, can you speak more and more fluently than me?

"Weighing"

Today is Saturday, October 15th. My father and I went shopping on South Street.

At around 8 o'clock in the morning, we took the bus to South Street. By chance, there was an old man at the platform with a "talking" scale next to him.

Seeing me coming over, the old man smiled and said, "Children, would you like to weigh yourself?

I asked curiously: "How much does it cost to weigh yourself once?"

The old man replied cheerfully: "It only costs 1 yuan to weigh yourself, and you can also measure your height!" ”

I thought: This is really killing two birds with one stone!

So, I stood firm on the scale. The old man turned on the switch, and I felt something soft hitting the top of my head. After touching it, a small rectangular note was printed on the machine, which said: "Weight: 27.0 kg, height 132.5 cm"! I have grown 4 cm in the past six months, but what about my weight?

At this time, I remembered that the teacher in the math class said that "kilogram" also has a name called "kilogram". I didn't expect that I would meet him today, and I knew that my weight had increased by 2 kilograms! < /p>

I am so happy on the way back! I must exercise well!

Interesting math questions

Today, I learned a lot from the book. I saw a very interesting question, and now I will introduce it to the children.

Xiao Zhao, Xiao Ding, and Xiao Zhang are teachers, doctors, and lawyers respectively. I only know that: (1) Xiao Zhao is older than the teacher; ( 2) Xiao Zhang and the teacher are of different ages; (3) Xiao Zhao and the lawyer are friends. Can you infer who is the teacher, who is the lawyer, and who is the doctor?

According to (1) Xiao Zhao is older than the teacher? Older age and (3) Xiao Zhao and the lawyer are friends, we can infer that Xiao Zhao is neither a teacher nor a lawyer, so Xiao Zhao is a doctor, and based on (2) Xiao Zhang and the teacher are different in age and Xiao Zhao is a doctor, we can see that Xiao Zhao is a doctor. Zhang is a lawyer, so the remaining Xiao Ding is a teacher.

This question is very simple. I used the elimination method. For example: according to conditions (1) and (3), we can see that Xiao Zhao. We are neither teachers nor lawyers. We can get the answer by analogy. In the process of learning mathematics, we can solve all problems as long as we master the methods. Unexpectedly, we can also get fun from mathematics.

Numbers in Sports

On November 24, our school ushered in the annual sports meeting.

Track and field includes 24-meter round-trip running, 60 meters, 100 meters, 200 meters, 400 meters, 800 meters, 1200 meters, 1500 meters, 2000 meters, as well as softball and long jump. I found that they are all calculated in units of time and length, and winning and losing are determined by numbers.

Sports are also inseparable from mathematics!

Today, I read a book "The Story of Science" and felt very heavy in my heart.

It talked about mathematics His family was very poor, but he was very studious, so he was sent to school to study, but he was not serious and kept playing. One day the teacher talked to him: "The food you eat and the money you spend on school are all yours." The fruits of father's hard work, if you don't study hard now, who will you deserve?" He was inspired a lot, and he thought: When I grow up, I want to be an astronomer or a writer.

But later, he was influenced by a teacher who had returned from studying in Japan, and he turned his interest to mathematics. Do you know who he is?

He is the famous Chinese mathematician Su Buqing.

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Smoking is harmful to health. My father smokes a pack of cigarettes every day, 20 cigarettes per pack. I learned that each cigarette can shorten a person's life by 3 minutes, which means it will be shortened every day

20X3=60 Minute = 1 hour of life, which means 365 days

Hi! Hello everyone! My name is rectangle, my body is long, I have 4 sides and 4 right angles.

Hello! Hello everyone! My name is square, my body is long and square, and I also have 4 sides. However, my 4 sides are the same, and I have 4 right angles.

We have a lot in common with our long ones: they both have 4 sides, all opposite sides are equal, and they both have 4 right angles; the only difference between our long ones is that each side of the square is equal.

Look, how beautiful we are!

Rectangles and squares

There are many rectangles and squares in life.

The surface of the table is square, the surface of my bed is also square, and the surface of the clock is still square. ． ． ． ． ． ．

Let’s talk about rectangles. The surface of the book is rectangular, the surface of the door is rectangular, and the surface of the chair is still rectangular. ． ． ． ．

You see, rectangles and squares are so common in our lives. If you are like me, look around and you will find a lot of interesting mathematical knowledge. If you don’t believe it, try it.

The role of perimeter

There are many rectangles and squares in life. They all have perimeters, so what is the role of perimeter?

I found that its ability is really great in our lives. For example, if we want to build a fence for a rectangular flower bed, if we don’t know the circumference, the workers need to surround it. This happens again and again, and if it is too large If it's short, you have to lengthen it. If it's too long, you have to start over. You see how wasteful this is! So you only need to know the circumference, measure it, and do it once. It saves time and wood, how convenient!

If you are interested in perimeter, you can also look for it in your life, record it, and share it with other children!

Various shapes

There are various shapes in our world, including triangles, squares, rectangles, circles, trapezoids, etc.

In daily life, some shapes have different characteristics. For example: a square, its four sides are equal, and its four corners are all right angles. There are many square objects in life, such as the surface of a TV, the surface of a window, the surface of a cabinet. There are also many triangles One of the more special ones is the right triangle, which is our set of triangle rulers: I found a triangle with two equal sides and one angle is a right angle; another triangle has one side that is half of the other side and one angle. It is also a right angle. In daily necessities, I find that there are fewer triangles than squares and rectangles. I only found air conditioner shelves and flower stands that are triangular at home.

What interesting combinations can you make of these different shapes? Graphics? Try it, you will find it very interesting.

Our study room

Our study room is rectangular, its length is 7 meters and its width is 4 meters, sitting south and facing north.

As soon as you enter the door, you are facing a large purple-red desk. It is also rectangular, about 2.5 meters long and 1.2 meters wide. There is a smaller rectangular desk next to my father's desk, about 2 meters long and 1 meter wide. My mother often reads here.

There is also a row of sofas and a coffee table against the wall. , in the corner are an air conditioner, a water dispenser and bookcases, which are also rectangular

Finally, I found that I didn’t see a square in the study room of our home, how strange it is!

This is my study room, children are welcome to come and play!