Math Story of Grade Four (1) When Gauss was in elementary school, once after the teacher taught addition, because the teacher wanted to have a rest, he came up with a topic for the students to calculate. The theme is:
1+2+3+ .....+97+98+99+ 100 = ?
The teacher is thinking, now the children must start class! I used this as an excuse to go out, but Gauss stopped me! ! It turns out that Gauss has worked it out. Little friend, do you know how he did it?
Gauss told us how he worked it out: add 1 to 100, add 100 to 1, and add them to two lines, namely1+2+3+4+...+96+97.
100+99+98+97+96+ .....+4+3+2+ 1
= 10 1+ 10 1+ 10 1+ .....+ 10 1+ 10 1+ 10 1+ 10 1
10 1 has 100 sums, but the formula is repeated twice, so the answer obtained by dividing 10 100 by 2 is < 5050 & gt Since then, the learning process of Gauss Elementary School has already surpassed other students, laying the foundation for his future mathematics. Math genius!
Mathematics Story of Grade Four (2) Mathematics in Animals? Genius?
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 is composed 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 form a row? People? Glyph. ? People? The angle of the glyph is 1 10 degrees. More accurate calculations also show that? People? Half the included angle of the glyph? 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 coincidence or some kind of nature? Tacit understanding?
Spider knot? Gossip? The net is a complex and beautiful octagonal geometric pattern, and it is difficult for people to draw a symmetrical pattern like a spider's web even with the compass of a ruler.
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.
Real math? Genius? It's coral Coral wrote it on herself? Calendar? They are on their walls every year? Portrait? 365 stripes, obviously one day? Painting? One. Strangely, paleontologists find corals 350 million years ago every year? Painting? 400? Watercolor painting? . 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.
Math Story of Grade Four (3) In 46 BC, Roman Commander julius? Caesar specified the calendar. As he was born in July, in order to show his greatness, he decided to change July to? Julian month? , together with all single months, it is stipulated as 3 1 day, and bimonthly is 30 days. In this way, there is one more day in a year. February was the month when prisoners were executed in ancient Rome. In order to reduce the number of people executed, 1 day was reduced in February to 29 days. Augustus, Caesar's heir, was born in August. He imitated Caesar's practice and added 1 day in August as? August? And change 10 month and1February to 3 1 day, and change September 1 1 month to 30 days. There are 1 day in the whole year, and he has reduced 1 day since February, so February has become 28 days, and there are only 29 days in leap years.
In this way, there will be a big month in a single month before July, a big month in two months after July, and 28 days in February.