Mathematics makes children happy, which is not a cliche. How to cultivate children's interest is a problem faced by all teachers. The following is an interesting math problem in my fourth grade. I hope everyone will read it carefully!

Interesting math problem: red beans and mung beans

There are three boxes with lids on the table. There are two mung beans in one box, two red beans in the second box, a mung bean and a red bean in the other box. The lids of the three boxes are marked with "red beans", "red mung beans" and "mung beans" respectively, but the labels are all wrong. You can identify all the beans in the box by taking out as many beans as possible.

A. one box, one pill;

B. Take one from each of the two boxes;

C. One box, two capsules;

D, taking one capsule from each of the three boxes;

Interesting math problem: balance problem

French mathematician Basher? De? Bachet de Meiziriac mentioned such a problem in his "Interesting Problems in Mathematics" (1624): How to weigh an object from an integer pound to 40 pounds with four weights? Now, how many pounds are these four weights to solve the problem?

a . 1 2 4 8；

b . 1 3 9 27；

c . 1 4 15 20；

D. None of the above answers are correct.

Interesting math problem: dividing horses on the farm

After his death, the farm owner left his sons 65,438+07 horses. What did he write in his will? Half of the eldest son, one third of the second son and one ninth of the youngest son. The three sons are really annoyed, but they just don't know how to divide them. Do you know that?/You know what? Do you know that?/You know what?

A the eldest son got 10 horse, the second son got 6 horses, and the youngest son got 1 horse.

The eldest son got 8 horses, the second son got 6 horses and the youngest son got 3 horses.

C The eldest son got 9 horses, the second son got 6 horses and the youngest son got 2 horses.

D. None of the above answers are correct.

Interesting math problem: buy a color TV.

A family consisting of father A, mother B and three children (C, D, E) bought a color TV. On the first night after they bought it, there were the following correct statements about how many people in the family watched TV:

1. A is watching TV and B is watching;

2.d and E or both, or one of them;

3. Only one person saw B and C;

4.c and D or both, or none;

5. If E saw it, then A and D also saw it.

Who watched TV tonight?

A.AB.dc.c.ABcd.dc or ab

Interesting math problem: straight flush

Draw 7 straight flushes from 52 cards, so how many cards do you need to draw at most?

A.28b.25c.26d None of the above answers are correct.

Interesting math problem: gambling competition

Four teams, A, B, C and D, played a game, and the audience A, B and C guessed the result of the game.

A: "A can only take the third place, and C is the champion";

B: "C can only rank second, while B ranks third",

C: "D comes second, A comes first".

At the end of the game, they guessed only half of the real ranking correctly. Please give us the ranking of the game.

A. A won the third place, B won the first place, C won the second place and D won the fourth place.

B.A won the third place, B won the third place, C won the second place, and D won the second place.

C. A won the fourth place, B won the third place, C won the championship and D won the second place.

D. None of the above answers are correct.

Interesting math problem: You ran the second place in the competition. Where are you?

A: If you surpass the second place, you just take that person's place, and then you are the second place.

Interesting math problem: You took part in the competition, and you surpassed the last one. Where are you?

A: How can you surpass the last one in the competition, so that you won't be the second from the bottom. If it's a long-distance race, you're at least one lap ahead of the last one.

Interesting math problem: mental arithmetic problem, add 40 to 1000, add 1000, add 30, add 1000, now add 20, now add 1000, what's the total?

A: Many people will mistake the answer for 5 100. Actually the correct answer is 4 100. Try using a calculator yourself if you don't believe me.

Interesting math problem: add 1=4 2=8 3= 16 4=?

A: Because1= 4,4 =1.

Interesting math problem: There are 9 lights in the classroom, 3 lights are turned off, how many lights are left?

A: The problem is how many lights are left, not how many lights are left, so there were nine lights, and now there are nine lights.

Interesting math problem: 8 candles were lit on the table, 5 were blown out, how many are left?

A: What was not blown out was finally burned out, and there were only five left.

Interesting math problem: Three people drank three bottles of water in three days, and how many bottles did nine people drink in nine days?

A: Three people drink three bottles of water three days, that is, one person drinks 1/3 bottles of water a day and nine people drink 1/3*9*9=27 bottles of water nine days.

Interesting math problem: the sum of the minuend, the minuend and the difference is 16. What is the value of the minuend?

Answer: Because the minuend-minuend = difference, that is, the minuend = difference+minuend, the minuend is exactly half of the sum of the three values (16), so the minuend is equal to 8.

Interesting math problem: it takes 3 minutes to steam 1 steamed bread, and how many minutes does it take to steam 5 steamed buns?

A: Generally, steamed buns are steamed together. The time for steaming five steamed buns is the same as that for steaming one steamed bun, which is three minutes.

Interesting math problem: 7 lambs play hide-and-seek and have found 3 lambs. How many lambs have not been found?

A: In the game of hide-and-seek, because one lamb is responsible for looking for the other six lambs, three lambs have been found, so three have not been found.

Interesting math problem: There is a book that both brothers want to buy. Brother is short of 5 yuan, brother is short of 1 point. But two people buy books together, and the money is still not enough. Do you know the price of this book? How much money do they each have?

Answer: The price of this book is 5 yuan. My brother doesn't have any money. My brother has 4.99 yuan. I suggest: suppose my brother has X yuan and my brother has Y yuan. Let's try the equation! )

Interesting math problem: a farmer took three rabbits to the market to sell, each rabbit was about three or four kilograms, but the farmer's scale could only weigh more than five kilograms. How should he weigh them?

Answer: weigh three first, then take one, and then calculate the difference after weighing. Taking the whole as the principle is also a very important way to solve problems.

Interesting math problem: A man bought a chicken for 8 yuan, sold it for 9 yuan, and then he thought it was not worthwhile. He bought it back at 10 yuan and sold it to another person at 1 1 yuan. Ask him how much money he earned.

Answer: 2 yuan. Earn 9-8= 1 yuan for the first time,110 =1yuan for the second time, 1+ 1=2 yuan for the second time. This question is very simple, you should be smart enough to do this sub-question!

Interesting math problem: suppose there is a pond with infinite water and two empty kettles with a capacity of 5 liters and 6 liters respectively. The problem is how to get 3 liters of water from the pond with only these two kettles.

Answer: Fill a 5-liter pot and pour it into a 6-liter pot. Then pour the 5 liter pot into the 6 liter pot until the 6 liter pot is full. At this time, there are 4 liters of water left in the 5-liter pot. Pour all the water out of the 6-liter pot, and pour the remaining 4 liters of water from the 5-liter pot into the 6-liter pot. At this time, there are only 4 liters of water in the 6-liter pot. Fill the 5-liter pot again and pour into the 6-liter pot until the 6-liter pot is full. At this time, there are only 3 liters of water left in the 5-liter pot.

Interesting math problem: 24 people are arranged in 6 columns, and 5 people are required to be a column. Do you know how to arrange them?

Answer: A hexagon. (I heard that the person who did this question correctly got full marks in spatial imagination ~)

Interesting math problem: If you have five cats and eat five fish at the same time, it will take five minutes to finish. At the same speed, how many minutes does it take 100 cats to eat 100 fish at the same time?

Answer: 5 minutes. Don't be scared by numbers, in fact, it's just that every cat eats a fish at the same time ~

Interesting math problem: Xiao Xin bought a batch of small toys. 10 for each group, minus 2 points; If each group is 12, then you have just finished scoring, but you will lose one group. Please think about it. How many toys does a * * * have?

A: There are 48 toys in this batch. The same set of toys ***X, and then the equation can work out the answer.

;