One day in math diary's fourth grade was my father's birthday, and my mother and I forgot it, so this day was to make up for it.
In the evening, my mother and I went to the cake shop to order cakes. I chose a big cake and asked for 50 yuan. Mother thought the cake would be ready in half an hour, so she bought three cupcakes for my father, sister Wang and me. Every cup of 2 yuan, all the way to 56 yuan. My mother asked my aunt to make it cheaper and only spent 55 yuan. Mother saw that there was only one last cup left in the window. Mom said, "We often order cakes at your house, so give us that cup!" " "Aunt agreed. In this way, we have four cups, which is equivalent to spending only 1 yuan 25 cents per cup. I bought these for my father voluntarily with lucky money.
After ordering the cake, we happily went to menstruation's house for dinner, and grandparents were still waiting there!
Today, I came across such incredible data in a book: "A piece of paper with a thickness of 0.0 1 cm is even thicker than Mount Everest after being folded in half for 30 times?"
This data is a bit "absurd" no matter how you listen to it. After all, it is a thin piece of paper. Can folding in half really surpass Everest? But many unexpected things may happen, so only through calculation can we uncover the mystery of all this.
Immediately I multiplied 0.0 1 cm by 2,1* * 30 times to get10737418.24cm.. Then, I converted the height of Mount Everest from 8848. 13 m to 8848 13 cm. By comparison, it is obvious that the thickness of paper folded in half for 30 times is indeed better than the height of Mount Everest, which is more than 10 times of the latter.
In fact, amazing data like this are everywhere in ordinary life, as long as you have a pair of eyes that are good at discovering.
Math diary, Grade Four, Grade Three, in today's math class, we learned quadrilateral, which includes parallelogram, square and rectangle. The teacher told us that these figures are often used in our daily life.
On my way home from school, I looked around. Most of the doors, windows and seats on the bus are rectangular, and some are square. When I got home, I saw quadrangles used in many places, such as tables, stools and wardrobes. How useful quadrangles are!
Suddenly I thought of my brother's set of toys, called Tangram. My brother and I found it. This toy has seven different shapes, including five triangles, a parallelogram and a square. But they can spell many different shapes. My brother and I played together. I spelled out a small fish, a small pine tree, a swan, a duck, a swallow, a dancer and a gymnast according to the introduction on the drawing, and finally spelled out a plane, a train, a truck and a house. They are so interesting that they spell different numbers.
Seeing that we were so happy, my father told us that the jigsaw puzzle, also called the "wisdom board", was invented by ancient people in China. It is small in number, but it can spell out many kinds of graphics. Simple seven boards spell out ever-changing figures. Tangram has also spread abroad, and some foreigners play it all night, calling it "Tangtu", which means "Puzzle from China". It has been spread all over the world today.
We had a good time today. The graphics are so interesting!
On the fourth day of math diary's fourth grade, I followed my mother to the market to buy food. Mom said, "I will test you today. Will you buy your favorite dishes?" My mother gave me 20 yuan to watch my performance. "Make sure the task is completed." I said confidently. So, I walked and watched, and came to the vegetable area. At this moment, I saw an aunt selling white and tender fresh mushrooms. I think: the leftovers at home can be cooked with mushrooms. So, I asked the aunt who sells vegetables: "Aunt, how much is a catty of mushrooms?" Aunt smiled and said to me, "Little friend, this mushroom costs 7 yuan a catty. How much catty do you want?" "Aunt, I only need to buy half a catty." I think: 7 divided by 2 equals 3. 5 yuan, 20 MINUS 3. 5 equals 16. 5 yuan. I thought about it and gave my aunt a note of money from 20 yuan, reminding her to call me at 16. 5 yuan. I went to the meat department again and saw an uncle selling meat, so I asked, "Uncle, how much is a catty of meat?" "10 yuan a catty." "Then I'll buy a catty." On second thought: 16. 5 minus 10 equals 6. 5 yuan. I play 16. 10 yuan in 5 yuan was given to Uncle.
When I came out of the market, my mother saw that I had both meat and vegetables and 6. When I was in 5 yuan, I smiled and said to me, "Learn to buy food!"
Through this test, I feel that there are many mysteries of mathematics hidden in our lives, and the ability to learn mathematics is really important. And don't be proud. You should study hard and master more math skills in order to apply what you have learned and solve the problems around you.
Math diary, Grade Four and Grade Five, had a special math exam this afternoon. Teacher Fang said: This is a test for the whole school. I feel horrible. The whole school will take the exam. As a result, I didn't know the topic until I handed out the test paper.
The exam has started, and the people in our class are not so nervous. And I am very nervous, because although there are few questions, it is not difficult. But a lot, I'm not that flustered. But I was afraid that I was too careless, so I finished writing and checked it carefully.
But when we check the last question, it's time. The time is 25 minutes, and now I think: I hope I am not wrong. This is how we correct it. Students, take a look. Requirements: You can't approve at will. I approved xx. You can't tell anyone whose approval you approved. Look at the answer I found that Huang Zi made four mistakes, so I circled them.
After I finished a batch, I heard Xia xx say: Xia xx is my batch. I asked xx: How many points did I get in the exam? She said: a hundred. I was so happy that I wrote this composition.