Children's classic math brain teasers: Q&A1;
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.
Children's classic brain teaser question and answer 2:
A truck driver knocked down a motorcyclist. The truck driver was seriously injured, but the motorcyclist was okay?
Answer: The truck driver didn't drive at that time.
In ancient times, who became a father-in-law first and then a father?
Answer: eunuch
Xiao Li hurt his face by drinking. When he came home, he was afraid that his wife would blame him. He went to the bathroom and put a band-aid on the mirror, but his wife scolded him the next day. Why?
Answer: The wound sticks to the mirror.
If someone asks you for directions, which sentence are you most afraid of hearing?
Answer: Is this the earth?
What kind of competition does the winner get no prize and the loser gets a prize?
Answer: punch in and drink.
Xiao Zhang was locked in an unlocked room, but he couldn't open the door with all his strength. Why?
Answer: Just push it away.
There is a cow with its head facing north. It turns right three times, then turns back three times and turns right again. Where does its tail turn at this time?
Answer: Next.
Why do hospitals never accept patients?
Answer: Veterinary hospital
Two fathers and sons went to buy hats, and each bought one. Why did they only buy three?
Answer: Three generations.
What melon can't be eaten?
Answer: fool
Why do four 9s add up to 100?
Answer: 99+9/9 = 100.
When someone knocks at the door, you will never say come in.
Answer: When going to the toilet.
When Xiao Wang stood guard at the post, he clearly saw an enemy quietly touching him. Why did he turn a blind eye?
Answer: aim at the target.
Is it black-bone chicken or white chicken? Why?
Answer: Black chickens are very powerful. They can lay white eggs, but white chickens can't lay black eggs.
Everything in the world melts when heated, but one thing solidifies when heated. What is this?
Answer: eggs
In an exam, a pair of deskmates handed in the same test paper, but the teacher thought they definitely didn't cheat. Why?
Answer: It's all blank.
What is the product with the same production date and effective date?
Answer: newspapers
There is a person born to your parents, but he is not your brother or sister. Who is he?
Answer: myself.
Children's classic math brain teasers related articles;
1. On children's math brain teasers
2. Children's brain teasers and answers
3. Pupils' math brain teasers and answers
4. Children's math brain teasers and answers
5. Children's brain teaser answer book