Select 50 classic puzzles about olympiad;
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 money. Why?
It takes three minutes for three children to eat three cakes, and how long does it take for ninety children to eat ninety cakes?
4. There are two blind people. They all bought two pairs of black socks and two pairs of white socks. Eight pairs of socks are all made of exactly the same cloth and size, and each pair of socks is connected with trademark paper. Two blind people accidentally mixed up eight pairs of socks. How can each of them get back two pairs of black socks and two pairs of white socks?
Fill in the blank:11235 _ _134.
6. What word is universal?
7. The clock just struck 13. What should you do now?
8. What were the four great inventions of ancient China? (Name the second name)
9. Mom has seven pieces of candy. She wants to give them to the three children equally, but she doesn't want to cut the remaining candy. What should mom do?
10, cheating in the exam (with a math noun)
1 1. The canteen brought back 70 baskets of Chinese cabbage and radishes, more radishes than Chinese cabbage 18 baskets. Then, the Chinese cabbage () basket and the radish () basket were brought back.
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. The house has four corners. There is a cat in a corner. There are four cats in front of each cat. How many cats are there in the room?
Any power of 14. 1 is the idiom ().
15. There is a row of trees along the road in the park, and the distance between each tree is 3 meters. What is the distance between the first tree and the sixth tree?
16. On the vast grassland, there is a cow grazing. 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?
17. 1 yuan can buy a bottle of soda. After drinking soda, two empty bottles can be exchanged for one. Q: If you have 20 yuan money, how many bottles of soda can you drink at most?
18. The topic is like this: 1=5 2=25 3=75 4=2435 Q 5=?
19. Please move only one step to make 62-63= 1 hold.
20. Fill in the blank: 1247 _ _ 1622
2 1. A puppy tied a rope to a tree trunk, greedy for a bone on the ground, but the rope was not long enough, 5 cm shorter. How do you teach dogs to scratch bones?
22. Fill in the blank:11/21/31/4 _ _1/7.
23. The highest peak in the world is _ _ _ _ _, and its height is _ _ _ _ _ _.
Six horses pulled a cart for six miles. How many miles did each horse run? How many miles did six horses run at a time?
25. In ancient China, the mathematician who calculated pi to seven decimal places was _ _ _ _ _, and its value was _ _ _ _.
26 9 inches+1 inch = 1 foot, type an idiom as ()
27. A famous mathematician in China proved the Goldbach conjecture of "1+ 1". This scientist is _ _ _
A Qiu Chengtong B Chen Jingrun C D Hua
28. Imagine you are in front of a mirror, and the image in the mirror can be reversed. How can you make the image upside down?
29. Fill in the blanks with numbers: 3 6 12 ___ 48 96
Please name three four-character idioms (words) related to numbers. They must be everyday expressions.
3 1, Xiao Wang said that under certain conditions 4- 1=5, and proved it in some way. Ask him how he proved it. guess
32. There are 10 eggs, and how many eggs are there in a dozen?
33, 1, 2, 5, 6, 7, 8 type an idiom.
34. Eight rings are connected together. Can you separate all eight rings by cutting only one of them?
35, 2, 4, 6, 8, 10 Type an idiom.
36. The train from Beijing to Hangzhou takes 15 hours. Now the train has been running for seven hours. Where is it now?
37. Under what circumstances was it once the same as a ton?
38. Where is the mortality rate in the world?
Can you write a number greater than 3 and less than 4 with three pieces of chalk?
40. Goodbye, Mom. Type a common math noun.
4 1, do a few things next week, buy books, watch exhibitions, pay the house fee at the bank and see a doctor. Bookstores are closed on Tuesdays, banks are closed on Saturdays and Sundays, exhibition halls are closed on Tuesdays, Wednesdays and Fridays, and hospitals are open on Tuesdays, Fridays and Saturdays. When can I go out and finish everything in one day?
42. What mark can be added between two numbers 2 and 3 to get a number greater than 2 and less than 3?
43, 18, 20, 23, 28, 35, _ _ _ _ _ Please fill in the appropriate numbers in the line.
A 42 B 46 C 48 D 5 1
44.a is 5 km away from the school, and B is 10km away from the school. How many kilometers are a and b apart?
45,5,4,3,2, 1 came across a mathematical term.
46. divide the oil in the bottle equally
There are two bottles of the same size, shape and weight. One bottle contains more than half of the oil, and the other bottle has no oil. Excuse me: How to divide the oil equally without any weighing tools?
47. How much did you lose by selling shoes?
A boss selling shoes, a pair of shoes bought by 20 yuan, sold by 30 yuan.
The guest gave 50 yuan, but the boss didn't have any change, so he gave this 50 yuan to his neighbor and changed it into five 10 yuan, and returned it to the guest 20 yuan. Later, the neighbor found out that 50 yuan was a counterfeit banknote, and the boss wanted to compensate his neighbor 50 yuan. Ask the boss how much he lost.
48. Seemingly simple mathematical problems of addition and multiplication
1+ 1+ 1+ 1+ 1
1+ 1+ 1+ 1+ 1
1+ 1? 0+ 1=?
What should I fill in the question mark?
49. Time math problem of burning incense
There are two incense sticks, which burn for one hour. How to burn incense to determine the time of fifteen minutes? Tip: the problem is not to burn it in fifteen minutes, but to determine the time of fifteen minutes.
50. Math problem: Calculate the length of the rope and the depth of the well.
I don't know how deep the well is, but I don't know how long the rope is.
Fold the rope into three folds and hang one end at the bottom of the well. When the lower end of the rope reaches the bottom hole, the upper end is lower than the wellhead 1 ft. If the rope is folded in two, when the lower end reaches the bottom of the well, the upper end is 6 feet higher. Do you know how deep this well is? How long is the rope?