Math brain teaser 1. The number without the first number is 13, and the number without the last number is 40. What's the number, please Answer: Forty-three
2. Savi watches movies in the cinema. Why does he always watch incoherent movies? Answer: I always watch and sleep for a while.
3. Why does it cost 1 10,000 yuan to buy one cow and 50,000 yuan to buy three cows? Answer: Three cows are certainly more expensive than one cow.
Please fill in a number in the brackets to make the following formula hold: 98765432 * () = 8888888888 Answer: 9.
5. A person was born in 10 BC and died in 10 AD, the day before his birthday. How many years did this man live when he died? Answer: 19
6. A Yan has 10 coins in his pocket, but he missed 10 coins. What else is in his pocket? Answer: A hole.
7. A boat has to ferry 37 people, and only 7 people can be ferried at a time. How many times can it be completed? Answer: Six times, because every time a rower comes back.
8./kloc-the fat girl of 0/00 kg heard that cycling can lose weight, so she tried it. Guess what? Answer: thin horse 10 kg.
9.？ Fifty cents? Guess geometry? Answer: semicircle, because 1 yuan /2=5 angle = semicircle.
10. Two chess friends played nine games a day and won the same number of times without a draw. What happened? Answer: Not all 9 sets were played by the two of them.
Brainstorm with mathematics 1. Why can't a glib person smile and talk to you? Answer: He is in the photo.
2. If you want to tie 10 horses, you can only tie one horse, not two. How can you tie it? Answer: 1+3+6= 10.
3. When will the clock in Times Square ring 13? Answer: when it is time to repair.
A catty of cabbage is fifty cents, and a catty of radish is sixty cents. How much is that catty of ribs? Answer: One or two equals ten yuan, and one catty is 100 yuan.
In the exam, Xiaohua rolled the dice to decide the answer, but there were 20 questions. Why did he throw it 40 times? Answer: He wants to check it again.
6. A paratrooper class to train skydiving. The monitor said they had to jump out of the plane for 30 seconds before they could pull the umbrella. As a result, everyone else landed safely, and only one person died unfortunately. Why? Answer: Because of that? stutter
7. Boss Li keeps some red goldfish and some black goldfish. He found that the red goldfish ate twice as much fish food as the black goldfish. What is the reason? Answer: Because there are twice as many red goldfish as black goldfish.
8. A high-speed car is passing a 90? Which wheel must leave the ground when turning? Answer: spare tire
9. A cage kept ten birds, and a pony shot and killed three. How many birds are left? Answer: Ten, three died and fell to the ground, and the other seven were alive.
10. You have a ship with 15 crew, 60 passengers and 300 tons of cargo. Can you work out the age of the shipowner according to the above tips? Answer: Do you still need to calculate the age of the shipowner?
How many eggs can I eat on an empty stomach? Answer: one, because you won't be on an empty stomach when you eat again.
12. A hundred men can't lift an object, but a woman can lift it with one hand. What is this object? Answer: an egg (just one egg, 100 people can't lift it)
13. There is no water in the pool and no soil on the ground (type)? Answer: Yes.
14. When is 3+ 1=5? A: When the calculation is wrong.
15. There is a family of four brothers. The age of the four of them is 14. How old are they? Answer: 1, 1, 2, 7, including twins.
16. Bangkok is in the rainy season. One day at midnight 12, there was a heavy rain. Q: Will the local sun shine in 72 hours? Answer: The sun will not appear at midnight 12 after 72 hours.
17. The height under the bridge can only be limited to ten meters, but the cargo on board has exceeded ten meters. What should I do? Answer: If you put some big stones on the boat, it will sink a little.
18. There are three foxes on the mountain. The hunter shot and killed one. How many foxes are there on the mountain? Answer: one
19. Please add a note to [5+5+5=550] to make the equation hold (it cannot be changed into inequality)? Answer: Just add an apostrophe to one of the plus signs (545+5=550).
20. One night, a strong wind blew. At this time, there are always 65,438+02 lighted candles on a table. First three were blown out by the wind, and then two were blown out by a gust of wind. Finally, how many candles are left on the table? Answer: 5, everything else is burnt out.
2 1.3, 3, 8, 8 How to calculate 24 by addition, subtraction, multiplication and division? Answer: 8/(3-8/3)=24
22. Several students lined up to get on the school bus. There are four students in front of four students, four students behind them and four students among them. How many students are there in a * *? Answer: 8
23. Heavy smoker A smokes 50 cigarettes a day, while heavy smoker B smokes 10 cigarettes a day. Five years later, smoker B smoked more cigarettes than smoker A. Why? A: Heavy smoker A smoked too much and died young.
24. The teacher put five apples in the basket for five children. Every child will get one, but there is still one in the basket. How to divide it? Answer: Five people divide one into four.
25. If the first number before a number is 1 1 and the last number is 50, what is the original number? Answer: Fifty-one
26. Why does Charlie say that his home is the answer? Because mom and dad and Charlie were born in different places.
27. There is a ladder hanging on the side of the boat, 2 meters away from the sea surface, and the sea water rises by half a meter every hour. How many hours can seawater submerge the ladder? A: When a rising tide lifts a boat, water will not drown the ladder.
28. Three people wanted to cross the road, and there was no traffic at that time. Only two people walked to one side of the sidewalk. Where's the other guy? Answer: On the other side of the road.
29. Why does 60 yuan buy one and 20 yuan buy two? Answer: Exchange a 100 dollar bill for a $40 thing.
30. Monkeys can break a corn every minute. How many corns can a monkey break in an orchard in five minutes? Answer: I didn't get one.
The doctor gave you three pills and told you to take one every half hour. How long will it take to complete? A: One hour.
32. Three students played checkers for 45 minutes. How long did each student play? Answer: 45 minutes
33. 1 people eat 1 fast food, 1 more fast food, 1 people eat two fast food, two less fast food, how many people, how many fast food? Answer: Three people and four fast foods.
34. Put three burning candles on the balance. All three candles burn at the same speed. Which side will the balance tilt to in the end? Answer: balance.
Interesting math and brain teasers 1. Suppose 1=5 2=6 3=8 4=7 5=?
Answer: 1
2. A tailor has a piece of woolen cloth, which is16m long. She cuts 2 meters from it every day and asks how many days later, she cuts the last piece of woolen cloth.
Answer: (8- 1)=7 (days)
3.a b c + c d c = a b c d
How much is abcd?
Answer: a= 1 c=9 d=8 b=0.
109+989= 1098
4. Ali said that under certain conditions, 4- 1=5, and said that Xiaoying can prove the correctness of this method by graphic means. After Ali produced the evidence, she had nothing to say. How did Ali prove the test? Guess.
Answer: A table with four corners has five corners after cutting off one corner with a knife.
5. The price of each bottle of soda is 1.00 CNY, and every two empty bottles can be directly exchanged for 1 bottle of soda. If you buy soda with 20.00 CNY, how many bottles can you drink?
Answer: 1. Buy 20 bottles, drink 20 bottles, and empty 10 bottles (20).
2.20 Empty bottles are 10 bottles, drinking 10 bottles and empty 10 bottles (10).
3. 10 5 bottles for empty bottles, 5 bottles for drinking, 5 bottles for empty bottles (5)
4.5 Empty bottles for 2 bottles, drink 2 bottles and empty 3 bottles (2)
5.3 Empty bottles are 1 bottle, drink 1 bottle and empty 2 bottles (1).
6.2 Empty bottles are 1 bottle, 1 bottle, and empty bottles are 1 bottle (1).
7. Borrow 1 empty bottle, * * 2 empty bottle, exchange 1 bottle for drinking, and exchange the empty bottle for someone else (1).
Total: 20+10+5+2+1+1= 40 bottles.
6. 1-70 1=2 spelled with matchsticks. Move a matchstick to make the equation hold.
Answer: 1 plus the minus sign on 1 = 2...7.
7. When is 5 greater than 0, 0 greater than 2, and 2 greater than 5?
Answer: 5 is cloth, 0 is stone and 2 is scissors.
8. An officer made 24 soldiers stand in six rows, each with five people. Soldiers are all stupid. The last soldier finally came up with a good idea. How did he arrange it?
Answer: Just arrange in a hexagon.
9. How many eggs are there in a dozen?
Answer: 0, because it is broken.
10. A person bought a chicken for 8 yuan, sold it for 9 yuan, and then thought it was not worthwhile. He bought it with 10 yuan, and bought another one with 1 1 yuan. How much did he earn?
This is an interview question:
There are three algorithms:
1. At first, there was only 8 yuan, and finally you had 1 1 yuan, so you earned 3 yuan;
2. The first time the protagonist lost 8 pieces, and the second time he got a chicken; The hero gets 9 pieces and loses a chicken; On the third sale, the hero lost 10 and got a chicken. In the fourth transaction, the hero got 1 1, and one chicken was missing, so the total GDP was 8+9+10+1= 38 yuan +4 chickens.
There are three transactions in the whole event. Let's see which three deals are specific.
The first transaction: 8 yuan buys, 9 yuan sells, and gains 1 yuan;
The second transaction: 9 yuan sells, 10 yuan buys, and the profit is-1 yuan;
The third transaction: 10 yuan buys, 1 1 yuan sells for profit 1 yuan;
The whole process:1-1+1=1yuan.
So the analysis shows that this person is a fool, because the last two transactions are equal to nothing.