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 everyone how he worked it out: add 1 to 100, and add 100 to 1, adding two lines, that is:
1+2+3+4+ .....+96+97+98+99+ 100
100+99+98+97+96+ .....+4+3+2+ 1
= 10 1+ 10 1+ 10 1+ .....+ 10 1+ 10 1+ 10 1+ 10 1
* * * There are one hundred sums 10 1, but the formula is repeated twice, so the answer is equal to < 5050 & gt.
Since then, the learning process of Gauss Elementary School has already surpassed other students, which laid the foundation for his future mathematics and made him a mathematical genius!
Bajie went to Huaguoshan to find Wukong, but the Great Sage was not at home. The little monkeys warmly entertained Bajie and picked 100 of the most delicious peaches in the mountains. Bajie said happily, "Let's eat together!" How to eat? Counting ***30 monkeys, Bajie found a branch and drew it on the ground, and listed the formula, 100 ÷ 30 = 3... 1. Bajie pointed to the above three monkeys and said generously, "Each one can eat three pecans. Listen, I'll eat the remaining 60. The little monkeys were very grateful to Bajie. They thanked him one by one, and then each took his share. When Wukong came back, the little monkeys told Wukong how generous Bajie was today and why he only ate a peach. Seeing Pig's arrangement, Wukong shouted, "What a fool. "
During the math class break, Liu Zhanhao asked Happy Rui: Why do you think the wheel is round? Happy Rui drew a circle with a compass and said, "We measured the distance from any point on the circumference to the center of the circle and found that it was all equal. This is called radius. Make the wheel into a circle, put the axle on the center of the circle, and the distance between the axle and the ground is always equal to the radius of the wheel, so that the wheel can roll smoothly on the ground. If the wheel is square or triangular, and the distance from the rim to the center of the circle is not equal, the car will vibrate up and down when walking. Therefore, the wheel is round. " After listening, Liu Zhanhao understood, and he said with deep feeling: It seems that mathematics is inseparable everywhere!
The animal school held a children's song competition, with the elephant teacher as the referee. The little monkey raised his hand first and began to recite: "I can calculate carry addition, and the digits can only be added if they are aligned." The number of digits should be aligned with the number of digits. When the number of digits exceeds ten, the number of digits should be advanced to ten. Add ten and one to count quickly and accurately. As soon as the little monkey finished speaking, the puppy began to recite again: "abdication and subtraction are not difficult, just align the numbers." "If the single digits are small enough, ten people can borrow one. If ten people return, one will be ten, and if they return, one will be missing. How to reduce the ten digits, the ten digits will be reduced again and again. " Everyone applauded their wonderful performance. Teacher Elephant said, "Their nursery rhymes make us understand that both carry addition and abdication subtraction should win the championship, ok?" Everyone agrees and applauds them.
This afternoon, Sun Jiang told us a story about shopping with grandpa. Grandpa said there were not many dishes at home, and he was going to buy vegetables. I shouted, "Me too, me too. In this way, my grandfather and I set off. At the vegetable market, we looked around and saw a tomato seller. I think those tomatoes are big and round. I quickly stopped grandpa and picked a few big and red ones. After weighing, my grandfather asked me to calculate the price of these tomatoes. A kilo of tomatoes 1.5 yuan,1* * 2.5kg. Can't you multiply them? But it's not easy to ride like this! After thinking for a while, I thought of a good way, that is, using the learned multiplication and division method, I first asked for two kilograms of 3 yuan, and then asked for 0.5 kilograms of 0.75 yuan, so I bought 2.5 kilograms1* * at 3.75 yuan. Hearing that I worked it out, grandpa said happily, "Yes, it seems that you have not learned mathematics in vain for so many years!" ''
There was a theft in the street. The thief was so cunning that he didn't leave any clues at the scene, but the money in the safe was gone. How did the thief know the password? Conan found a small piece of paper at the scene with four numbers written on it: 1008, 1260, 1386, 1 134. But the password can only be three digits. What does it have to do with these four numbers? Suddenly Conan had a flash of light. He did a quick calculation, then pressed three numbers on the safe, and the safe was opened. Do you know the password? How did you get it?
The answer is1+8 =1+2+6 =1+0+3+4 = 91+3+8+6 =18.
The password is 9 18.
Word interest association
When Su Dongpo, a great poet in Song Dynasty, was young, he went to Beijing with several schoolmates to take the exam. When they arrived at the examination center, it was too late. The examiner said, "I made a couplet. If I get it right, I'll let you into the examination room." The examiner's couplet is: a boat alone, two or three students, four oars and five sails, crossing six beaches and seven bays, which is very late.
Su Dongpo's bottom line is: ten years of cold window, entering the 98 th Hospital, abandoning worldly desires, studying hard the Five Classics and Four Books, and taking the exam three times and two times. Today, he must succeed
The examiner and Su Dongpo both embedded ten numbers from one to ten in the couplets, which vividly described the hardships and hardships of the scholars.