Figure 1 of the fourth grade mathematics tabloid
Fourth grade math tabloid picture 2
The fourth grade mathematics tabloid Figure 3
The fourth grade mathematics tabloid content: the mathematics "genius" in animals
Honeycomb is a strictly hexagonal cylinder, with a flat hexagonal opening at one end and a closed hexagonal diamond bottom at the other end, which consists of three identical diamonds. The rhombic obtuse angle of the chassis is 109 degrees 28 minutes, and all acute angles are 70 degrees 32 minutes, which is both firm and material-saving. The honeycomb wall thickness is 0.073 mm, and the error is very small.
Red-crowned cranes always move in groups, and they are arranged in the word "people". The angle of the herringbone is 1 10 degrees. More accurate calculation also shows that the angle of the herringbone is half-that is, the angle between each side and the direction of the crane group is 54 degrees, 44 minutes and 8 seconds! And the angle of diamond crystal is exactly 54 degrees, 44 minutes and 8 seconds! Is it a coincidence or some "tacit understanding" of nature?
Spider's "gossip" net is a complex and beautiful octagonal geometric pattern, and it is difficult for people to draw a symmetrical pattern like a spider even with rulers and compasses.
In winter, when a cat sleeps, it always hugs its body into a ball. There is also mathematics in it, because the shape of the ball minimizes the surface area of the body, so it emits the least heat.
The real "genius" of mathematics is coral. Coral writes a "calendar" on its body, and "draws" 365 stripes on its wall every year, apparently one a day. Strangely, paleontologists found that corals 350 million years ago "painted" 400 watercolors every year. Astronomers tell us that at that time, the earth only had 2 1.9 hours a day, not 365 days a year, but 400 days.
The fourth grade mathematics tabloid content: interesting mathematics stories
I read a story today, asking swallows to try frogs. The story goes like this: One day, the swallow said to the frog, "Let's compare who is better at math. The frog agreed. Frog problem: Last Monday, I ate a pest. On Tuesday, I ate three pests. After that, I ate two more pests every day than the day before. How many pests do I eat in a week? The swallow said, "1+3 = 44+5 = 99+7 =1616+9 = 2525+1= 3636+13 ="
The frog said, "Test me." The swallow said, "I ate two pests last Monday, four on Tuesday, and then two more every day than the day before." Ask me for a week ... ""I ate 56 pests ". Before the swallow finished speaking, the frog had given the answer. The swallow said, "How fast! Teach me the trick of quick calculation. " The frog asked the swallow to draw seven circles, then put a pest in the first circle, and there were two more circles behind than in front. Their order is 1, 3, 5, 7, 9, 1 1, 13, which adds up to 49. The frog put a pest outside each circle and used it again. Swallows praise frogs for their cleverness.
The content of the fourth grade mathematics tabloid: a mathematician triggered by a story
Chen Jingrun, a famous mathematician, made great contributions to overcoming Goldbach's conjecture and founded the famous "Chen Theorem", so many people affectionately called him "the prince of mathematics". But who would have thought that his achievement originated from a story? 1937, diligent Chen Jingrun was admitted to Huaying College in Fuzhou. At this time, during the period of War of Resistance against Japanese Aggression, Professor Shen Yuan, director of the Department of Aeronautical Engineering in Tsinghua University, returned to Fujian to attend the funeral, unwilling to stay in his hometown because of the war. Several universities got the news and wanted to invite Professor Shen to give lectures. He declined the invitation. As he is an alumnus of Huaying, he came to this middle school to teach mathematics to his classmates in order to report to his alma mater. One day, Teacher Shen Yuan told us a story in math class: "A Frenchman discovered an interesting phenomenon 200 years ago: 6=3+3, 8=5+3, 10=5+5, 12=5+7, 28=5+23. Every even number greater than 4 can be expressed as the sum of two odd numbers. Because this conclusion has not been proved, it is still a guess. Euler said: Although I can't prove it, I am sure this conclusion is correct. It is like a beautiful light ring, shining with dazzling brilliance in front of us not far away. ..... "Chen Jingrun stare eyes, absorbed.
From then on, Chen Jingrun became interested in this wonderful question. In his spare time, he likes going to the library. He not only read the counseling books in middle schools, but also eagerly read the textbooks of mathematics and physics courses in these universities. Therefore, he got the nickname "bookworm". Interest is the first teacher. It is such a mathematical story that aroused Chen Jingrun's interest and his diligence and made him a great mathematician.
The fourth grade mathematics tabloid content: the story of mathematical symbols
A long time ago, the kingdom of mathematics was in chaos and disorder. The ten brothers from 0 to 9 not only dominate the kingdom, but also boast about their best skills. Digital angels were very angry when they saw this situation, so they sent three little angels, ">" and "< and =", to the mathematics kingdom, asking them to keep it in order.
Three little angels came to the kingdom of mathematics, and 0~9 brothers stared at them contemptuously. "9" asked, "What do you three do? You are not welcome in our kingdom. "
The angel smiled and said, We are the judges sent by the angel to your kingdom to help you manage your country well. I am an equal sign. The numbers on both sides of me are always equal. These two are' greater than number' and' less than number'. They open their mouths to big people and tip small people. "
On hearing that the judges were sent by digital angels, and with the introduction of "=", the ten brothers from 0 to 9 obediently obeyed ">", "<" and "=". Since then, the kingdom of mathematics has become more and more powerful. It has a very strict order, and no one will violate it.