Elementary school math problems

Interesting Math Questions and Answers in Primary School 1 Monks count rosaries. Xiaoming and Xiaoguang go to the temple to play. When they see monks sitting in meditation, they always count them one by one with rosaries in their hands. 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 up to 2." Xiao Ming added, "If you count to 1 trillion, I think it will take a few 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 it will count to 1 trillion in my life." Xiao Ming said, "Impossible, what you said is too long." Children, how long do you think it will take to count to one trillion? The problem of cattle eating grass was put forward by Newton, a great scientist. It seems simple but actually needs brains to solve. This question is like this: there is a pasture with 27 cows, and the grass is eaten in 6 days; If you raise 23 cows, you will eat the grass in 9 days; If you raise 21 cows, how many days can you finish eating the grass on the farm? Please note that the grass on the pasture is constantly growing, not fixed. Calculations in Pre-history Archaeologists found a pre-history mural in Spain, which was painted with some figures of human figures and beasts, as well as some puzzling calculations. These calculations were also Arabic numerals, but archaeologists couldn't figure out these calculations for a long time. Later, it dawned on them that the figures in these calculations were not the same as our current figures, but they were definitely in line with the law of four operations. Children, please look at these formulas carefully, think about what the numbers in the formulas are equal to now, and then translate them. 5+6+7=5×6×75+5=66÷5=67×5=7 Coin Problem One day, Fang Fang, Ming Ming and Li Li played together, and after playing for a while, they broke out in sweat. Fang Fang said, "Let's buy sorbet to eat." As he spoke, he took out a handful of coins from his pocket and saw that they were all five cents. Yan Mingming also took out a handful of coins from his pocket, all of which were 2 cents, and he also took out a handful of them, all of which were 1 cent. Three people put the money together, counted, a * * * is 1 yuan. "How much money did each of us bring?" Li Li asked. "I can't remember." Fang Fang said, "I only remember that my coins are twice as many as Ming Ming." "I have just twice as many coins as I have." Clearly said. "Let's share a flower." Fangfang said, grabbing coins and buying sorbet. Lili was thinking, how much money did each of us bring? Card problem On Sunday, Lin Lin went to Sensen's house to play, and saw Sensen fiddling with five cards on the table. These five cards were written with 4, 5, 6,+and = respectively. Lin Lin asked, "What are you putting on?" Sensen said, "I want to put these five cards into an equation." Lin Lin said, "Isn't it easy?" As he spoke, he set it up, but he couldn't set it up for a long time. 4+5, 4+6 and 5+6 all exceeded the maximum number of 6, while 6-5 and 6-4 were not enough for the minimum number of 4. "It's impossible. This equation will never be set up." Lin Lin said. "Can be put into it." Sensen said and put a formula on the table, which proved to be an equation. Little friend, do you know how Sensen put it? When did you meet Obana? MengMeng quarreled over a trivial matter, and no one spoke to anyone. Xiao Hong, the monitor, wanted to call the two of them together to talk, but no one went. This is really worrying Xiaohong. What can we do to get 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 is 6 o'clock in the morning, but Xiaohua goes every three days, while MengMeng goes every five days. Today is October 3rd. Obana and MengMeng all went this morning. Xiaohong knows that MengMeng will go tomorrow, so when can they meet next time? Xiaohong calculated the time when they met, and went that morning, so she met both of them 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 own practices and made self-criticism. Since then, they have become good friends. Children, can you figure out the date when Obana MengMeng met on the path? Galileo's Math Problem Galileo is a famous Italian scientist. Once he went to the racecourse to watch horse racing and got a math problem. This problem is like this. There is a happy track at the racecourse, which is 6 meters long. Now there are three horses, A, B and C. A can run 2 laps a minute, B can run 3 laps a minute and C can run 4 laps a minute. If these straight horses run side by side in the same starting line and in the same direction, how many minutes will it take for these three horses to line up at the starting line again? Mr. Zhao, Mr. Qian and Mr. Sun all weigh about 6 kilograms, but they don't know the exact number. Now there is only a 1-kilogram weight and a weighbridge. Is there any way to weigh them? Measuring the height of the pyramid is a famous Egyptian building, especially pyramid of khufu. The whole pyramid used 2.3 million stones, and it took 1, slaves 3 years to build this building. After the completion of the pyramid, the king asked another question, how high the pyramid was, and no one could 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, tallis, a famous scholar, appeared, and he ordered the executioners to stop. The king said, "Can you know the height of the pyramid?" Tallis said, "Yes, Your Majesty." The king said, "So 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 it was sunny, tallis came to the bottom of the pyramid with only a stick. The king sneered and said, "Do you want to cheat me with this broken stick? If you can't measure it today, then 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? Seventy-nine puppies and two hundred feet are walking on the ground. Think about it and count how many chickens are there? How many dogs? How many monks do you have? This is an ancient math problem: a hundred monks have a hundred swallows, four monks each have a swallows, four young monks have a swallows, and how many are there? A clever cockroach decided to look for the truth (the truth here is a tangible thing), and its field of vision is no more than 1cm. Truth lies at a point at the same time distance from Dcm. Cockroach can take a step, and the length of each step is not more than 1cm. After each step, someone will tell him whether he is close to the truth or far away. Cockroach can remember everything, including the direction of his own steps. Prove that it only needs to take no more than 1.5D+7 steps to find the truth. Cockroaches looking for truth "Early Bus of Mathematical Olympics" Cockroaches looking for truth Answer: Cockroaches can tentatively take one step to the east, south, west and north (after each step, they will return to their original place and then take the next step), so they can find out which general direction the "truth" is located in without exceeding the cockroach. If the plane in which it lies 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. -"Early Bus" (with changes) Interesting math problems and answers in primary schools 2 Interesting math problems 1. Xiaohua's father can cut five of his own nails in one minute. How many nails can he cut in five minutes? 2. Xiaohua took 5 yuan's money to the store to buy a car worth 38 yuan, but the salesman only gave him 2 yuan's money. Why? 3. 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? 4. Six horses pulled a cart and ran for six miles. How many miles did each horse run? How many miles did six horses run in one * *? 5. A puppy tied to a tree trunk is greedy for a bone on the ground, but the rope is not long enough, which is 5 cm short. How can you teach the dog to hold the bone? 6. Wang went from place A to place B. One minute later, Li went from place B to place A. When Wang and Li met on the way, which one was farther away from A? 7. The clock has just struck thirteen. 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 grass in 28. Q: How many years will it take to eat all the grass on the grass? 9. Mom has 7 pieces of candy, and wants to give them to three children equally, but she doesn't want to cut the rest of the candy. What should mom do? 1. There is a row of trees along the road in the park, and the distance between each tree is 3 meters. How many meters is the distance between the first tree and the sixth tree? 11. Divide 8 into two halves as follows. How much is each half? The average score of arithmetic method is _ _ _ _, the horizontal score from the middle is _ _ _ _, and the vertical score from the middle is _ _ _. 12. There are four corners of a house, and there are three cats in front of each cat. How many cats are there in the room? 13. A house has four corners. There is a cat in one corner. There are four cats in front of each cat. How many cats are there in the room? 14. Xiaojun, Xiaohong and Xiaoping played chess, and they always played 3 sets. Ask them how many chess games they have played. 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 number of sugar in their bags was exactly the same. Students, who do you think has more sugar? How many more? Answer 1, 2, including fingernails and toenails 2, because he paid the salesman 4 yuan, he only gave him 2 yuan; 3, , 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. When they met, they were in the same place, so they were as far away from A; 7. The clock should be repaired; 8. It will never eat up the grass, because the grass will keep growing; 9. Mom eats one piece first, and then gives two pieces to each child; 1, 15 meters; 11、4，，3。 12, 4; 13, 5; 14, 2 sets; 15. It turns out that Xiaohua has more sugar; 14-8=6 pieces, because the number of pieces of candy given to two people is exactly the same, so it turns out that Xiaohua is 12 pieces more than Xiaoming.