1. Mathematical brainstorming in Olympic mathematics in primary schools
1. Two trains that are 200 kilometers apart leave at a speed of 50 kilometers per hour. A fly took off from a train (when the two trains met 200 kilometers), went straight to the opposite train at a speed of 75 kilometers per hour, and then turned back to the first train. The fly kept flying like this until two trains collided and crushed the fly. So, how far did the fly fly fly from takeoff to death?
2. A train goes from new york to Boston. Five minutes later, another truck went from Boston to new york at twice the speed of the previous one.
When they met, which was closer to new york?
The circumference of the earth is about 40000 kilometers. If we circle the earth with iron wire and the circumference is 10 meter (equivalent to 0.0 1 km), can a flea, a rabbit or even a person crawl under it?
2. Mathematical brain teasers in Olympiad Primary School.
1. There are 8 fluorescent lamps in the classroom. After turning off two lights, there are () fluorescent lamps in the classroom. There are (8) fluorescent lamps in the classroom.
[Analysis] Although two fluorescent lamps were turned off, they were still turned off, so there are still eight in the classroom.
There are 48 apples and pears in the canteen. There are twice as many apples as pears. There are () apples and () pears.
There are (32) apples and (16) pears.
[Resolution] The number of apples is twice that of pears, which is equivalent to dividing all fruits into three parts, with apples accounting for two parts, pears accounting for one part, 48 ÷ 3 = 16 (one), apples accounting for two parts, 16× 2 = 32 (one) and pears accounting for one part,/kloc-0.
Lele is 7 years old, and her mother is 25 years older than Lele this year. Five years later, Lele was () years younger than her mother.
Five years later, Lele is 25 years younger than her mother.
3. Mathematical brain teasers in Olympiad Primary School
1. 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? 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
3. The number without the first number is 13, and the number without the last number is 40. What's the number, please -Answer: 43
A cage kept ten birds, and the 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.
5. Please add a note to [5+5+5 = 550] to make the equation hold (can't be changed into inequality)? Answer: Just add an apostrophe to one of the plus signs (545+5=550).
4. Mathematical brain teasers in Olympiad Primary School.
1. Divide 8 in half, as shown below. How much is each half? The average score of arithmetic method is _ _ _ _ points, from which the horizontal score is _ _ _ _ points, and from which the vertical score is _ _ _ _ _ points. The house has four corners. There is a cat in a corner. There are three cats in front of each cat. How many cats are there in the room?
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?
Xiaojun, Xiaohong and Xiaoping play chess. They always play three sets. Ask them how many games they played. Every game of chess is played by two people.
Xiaoming and Xiaohua each have a bag of sugar, 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 amount of sugar in their bags is exactly the same. Students, who do you think has more sugar? How much more?
5. Primary school Olympic math brain teasers.
1. 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? Xiaohua's father can cut off five of his own nails in 1 minute. How many nails can he cut in five minutes?
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?
Six horses pulled a cart and ran six miles. How many miles did each horse run? How many miles did six horses run at a time?
5. A puppy tied to a tree trunk was greedy for a bone on the ground, but the rope was not long enough, which was 5 cm shorter. How do you teach dogs to scratch bones?
6. Mathematical brain teasers in Olympiad Primary School.
1, Wang goes from a to b, 1 minutes later, Li goes from b to a, and meets Wang and Li on the way. Who is farther from A? The clock just struck 13. What should you do now?
There is a cow eating grass on the vast grassland. 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?
4. My mother has seven pieces of candy, and wants to share them equally with three children, but she doesn't want to cut the rest. What should my mother do?
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?