Xiaoming and Xiaoguang go to the temple to play. When they see monks meditating, they always count the beads in their hands one by one. Xiao Ming said, "How many can you count in a minute?" Xiaoguang looked at it for a while and said, "I think it can count to 200." Xiao Ming added, "If it is 1 trillion, I think it will take several days, eight days and eight nights at most." Xiaoguang said, "1 trillion is 1 trillion, right?" Xiao Ming said, "Yes." Xiaoguang said: "In that case, I don't think I can count 1 trillion in my life." Xiao Ming said, "Impossible, you speak too long." Children, how long do you think it will take to count to one trillion?

Cattle grazing

This question was put forward by the great scientist Newton. Seemingly simple, in fact, it needs to be solved with brains. The problem is this: there is a pasture with 27 cows, and the grass is eaten in 6 days; If you raise 23 cows, you will eat up the grass in 9 days; If you have 2 1 cow, how many days can you finish the grass on the farm? Please note that the grass on the pasture is constantly growing, not fixed.

Computational problems in early history

Archaeologists found a prehistoric mural in Spain, which drew some figures of human figures and wild animals, and also drew some puzzling calculation problems, which were also Arabic numerals, but archaeologists couldn't figure out these calculation problems after reading it for a long time. Later, they realized that these calculated figures are not quite the same as our current figures, but they definitely conform to the four algorithms. Children, please look at these formulas carefully, think about what the numbers in the formulas are now, and then translate them.

5+6+7=5×6×7

5+5=6

6÷5=6

7×5=7

Coin problem

One day, Fangfang, Mingming and Lili were playing together. After playing for a while, they broke out in a sweat. Fangfang said, "Let's buy sorbet to eat." As he spoke, he took out a handful of coins from his pocket. At first glance, they were all nickels. Yan Mingming also took out a handful of coins from his pocket, all of which were 2 cents, and also took out a force, all of which were 1 cent. Three people put the money together and counted it. One * * * is 1 yuan.

"How much money did each of us bring?" Li Li asked.

"I can't remember." Fangfang said, "I only remember that my coin was twice as big as Mingming's."

"I have exactly twice as many coins as I do." Clearly said.

"Let's share a flower." Fangfang grabbed the coin and went to buy sorbet.

Lily is thinking, how much money did each of us bring?

Card problem

On Sunday, Linlin went to Sensen's house and saw Sensen fiddling with five cards on the table. These five cards

The film says 4, 5, 6,+and = respectively.

Lin Lin asked, "What are you wearing?"

Sensen said, "I want to put these five cards together into an equation."

Lin Lin said, "Isn't it easy?"

He set it up as soon as he said it, but he couldn't set it up for a long time. 4+5, 4+6 and 5+6 all exceed the maximum number, and 6, 6-5 and 6-4 are not enough for the minimum number 4.

"This is impossible. This equation will never hold. " Lin Lin said.

"You can put it in." Sensen said, and put a formula on the table. It was an equation.

Little friend, do you know what Sensen said?

When shall we meet?

Obana and MengMeng quarreled over a trivial matter, and neither of them spoke to anyone. The monitor Xiaohong wanted to ask the two of them to talk together, but no one went. This really worries Xiaohong. What can we do to keep them together? It suddenly occurred to her that everyone in Obana and MengMeng has the habit of running in the morning, and they are all on the path next to the campus. It's 6 o'clock in the morning, but Xiaohua comes every three days and MengMeng comes every five days. Today is 654381October 3rd. Both Obana and MengMeng went this morning. Xiaohong knows that MengMeng will leave tomorrow, so when can we meet next time? Xiaohong calculated the time when they met and went that morning, so she met them both at the same time. She called them together and told them the truth of unity. They all realized that there was something wrong with their practices and made self-criticism. From then on, they became good friends. Children, can you guess the date when Obana MengMeng met on the path?

Galileo's mathematical problems

Galileo is a famous scientist in Italy. Once he went to the racecourse to watch horse races and came up with a math problem. Here's the question. There is a 600-meter-long happy track at the racecourse. Now there are three horses, A, B and C. A can run 2 laps a minute, Otsuichi can run 3 laps a minute and C can run 4 laps a minute. If these straight horses run side by side on the same starting line and in the same direction, how many minutes will it take for these three horses to get back on the starting line?

Clever trade-off

Mr. Zhao, Mr. Qian and Mr. Sun all weigh about 60 Jin, but I don't know the exact figure. Now there is only 100 kg weight and weighbridge. Is there any way to weigh them?

Skillfully measure the height of the pyramid

The pyramids are famous Egyptian buildings, especially pyramid of khufu. The entire pyramid used 2.3 million stones, and it took 65,438+10,000 slaves 30 years to build this building. After the completion of the pyramid, the king asked another question, how high is the pyramid? No one can answer this question. The king was furious and threw all the scholars who couldn't answer into the Nile. When the king tried to kill another scholar, the famous scholar tallis appeared and ordered the executioner to stop. The king said, "Can you know the height of the pyramid?" Tallis said, "Yes, Your Majesty." The king said, "Then how high is it?" Tallis calmly replied: "147 meters." The king asked, "Don't talk nonsense. How did you measure it? " Tallis said, "I can show it to you tomorrow."

The next day, when the sun was shining, tallis came to the bottom of the pyramid with only a stick. King Qi sneered, "You want to cheat me with this broken stick? If you can't measure it today, you will be thrown into the Nile! " Tallis replied unhurriedly, "If I can't measure it, it's not too late for your majesty to throw me into the Nile."

Then, tallis began to measure, and finally, the king had to accept that his measurement was reasonable.

Children, do you know how to measure in tallis?

How many chickens and dogs are there?

Chickens and puppies walk on the ground of 79 feet and 200 feet. Think about it and count it. How many chickens are there? How many dogs?

How many monks, big and small?

This is an old math problem: there are hundreds of monks, four for each big monk and one for each little monk. How many monks, big and small?

A clever cockroach decided to look for the truth (the truth here is tangible), and its field of vision did not exceed 1cm. Truth exists at the same time point as Dcm. Cockroaches can take one step, and the length of each step should not exceed 1cm. At every step, someone will tell him whether he is close to the truth or far away. Cockroaches can remember everything, including the direction of their steps.

It only takes no more than 1.5D+7 steps to find the truth.

The cockroach looking for truth "the early bus of mathematics Olympics"

Cockroaches seek answers to truth:

Cockroaches can tentatively take one step to the east, south, west and north (returning to the original place with each step, taking 1 step), so that they can find out which direction the "truth" is in without exceeding the cockroach. If its plane is divided into four parts, the side length of each square will not exceed 2Dcm (the largest Dcm) under the root sign.

Root number 2+7 < 1.5D+7

Get a license. -Early bus (subject to change)

Interesting math problems and answers in primary schools 2 interesting math problems

1, Xiaohua's father can cut off five of his own nails in 1 minute. How many nails can he cut in five minutes?

Xiaohua took 50 yuan's money to the store and bought a car worth 38 yuan, but the salesman only gave him 2 yuan's money. Why?

Xiaojun said, "I went fishing yesterday and caught a tailless fish, two headless fish and three half-baked fish. Guess how many fish I caught? " Students, guess how many fish Xiaojun caught?

Six horses pulled a cart and ran six miles. How many miles did each horse run? How many miles did six horses run at a time?

5. A puppy tied to a tree trunk was greedy for a bone on the ground, but the rope was not long enough, which was 5 cm shorter. How do you teach dogs to scratch bones?

6. Wang walks from place A to place B. 1 minute later, Li walks from place B to place A. When Wang and Li meet on the road, who is farther from A?

7. The clock just struck 13. What should you do now?

8. On the vast grassland, there is a cow eating grass. This Niu Yi only ate half of the grass on the grassland in 2008. Q: How many years does it take to eat all the grass on the lawn?

9. Mom has seven pieces of candy, and wants to share them equally with three children, but she doesn't want to cut the remaining candy. What should mom do?

10. There is a row of trees along the road in the park. The distance between each tree is 3 meters. What is the distance between the first tree and the sixth tree?

1 1. Divide 8 in half, as shown below. How much is each half? The average score of arithmetic method is _ _ _ _ points, from which the horizontal score is _ _ _ _ points, and from which the vertical score is _ _ _ _ _ points.

12, a house has four corners, one corner has a cat, and there are three cats in front of each cat. How many cats are there in the room?

13, a house has four corners, one corner has a cat, and there are four cats in front of each cat. How many cats are there in the room?

14, Xiaojun, Xiaohong and Xiaoping played chess for three sets. Ask them how many games they played. (Every chess game is played by two people)

15, Xiaoming and Xiaohua each have a bag of candy, but I don't know how many pieces there are in each bag. I only know that after Xiaoming gave Xiaohua 8 yuan, Xiaohua gave Xiaoming 14 yuan. At this time, the amount of sugar in their bags is exactly the same. Students, who do you think has more sugar? How much more?

answer

1 20, including fingernails and toenails

2. Because he paid the salesman 40 yuan, he only gave him 2 yuan;

3, 0, because the fish he caught does not exist;

4, 6 miles, 36 miles;

5. Just teach the puppy to turn around and grab the bone with its hind feet.

6. They were in the same place when they met, so they were as far away from A;

7. This clock should be repaired;

8. It will never eat all the grass, because the grass will always grow;

9. Mom eats one piece first, and then gives two pieces to each child;

10， 15m；

1 1、4,0,3。

12, 4;

13, 5;

14 and 2 disks;

15, the original floret sugar is more; 14-8=6 pieces, because the number of candy pieces of two people is exactly the same, so the result is that there are more small flowers than Xiaoming 12 pieces.