Simple calculation of mathematical problems in primary school Olympiad

How do you do? Many Primary School Mathematical Olympiad problems have simple methods

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1. Fill in the blanks with the appropriate letters so that each line forms a word, and then fill in the blanks in turn with the appropriate words 1.e( ) ( ) ( )（） 2.（）e（）（）( ) 3.( ) ( )e( )（） 4.( ) ( )（）e( ) 5.( ) ( ) ( ) ( ) e ( ) 1.Can you get to the music room at ( ）o clock? 2.The students ( ) their lesson at half past eight in the morning. 3.This T-shirt is expensive,that one is( ). 4.I( ）have lunch at home .I like eating outside. 5.Don not ( )to close the door.
2. Write a program for me to find the sum of the first 20 items of the following sequence: 2 / 1, 3 / 2, 5 / 3, 8 / 5, 13 / 8, 21 / 13
3. The order of 1, - 1 / 2,1 / 3, - 1 / 4,1 / 5, - 1 / 6... Is as follows First line 1 Second line - 1 / 2 1 / 3 The third line - 1 / 4 1 / 5 - 1 / 6 The fourth line 1 / 7 - 1 / 8 1 / 9 - 1 / 10 The fifth line 1 / 11 - 1 / 12 1 / 13 - 1 / 14 1 / 15 ······ Please write down the process, steps and details of the 10th number calculation from left to right in line 20
4. A math problem: calculate 24 points The geniuses use 12, 12, 31 to calculate 24 o'clock
5. When Xiao Hong read a story book, she read 5 / 1 of the total pages on the first day, 15 pages less than the first day on the second day, and 3 / 1 of the total pages in two days, Xiao Hong read a story book. On the first day, she read 5 / 1 of the total pages. On the second day, she read 15 pages less than on the first day. On the second day, she just read 3 / 1 of the total pages. How many pages did she read in the two days?
6. A passenger car and a freight car are going from place a to place B. the passenger car takes 8 hours to complete the whole journey, and the train takes 9 hours to complete the whole journey. These two cars go through the whole journey every hour What's the distance? Which car is faster? Hurry up
7. The speed of the car is 80 km / h, and that of the bus is 45 km / h. (1) after X hours, how many kilometers did the car and bus travel together? (2) after X hours, how many kilometers did the car travel more than the bus?
8. The diameter of a car's outer tire is 9 decimeters, and the wheels roll 400 cycles per minute. How many kilometers does the car advance per hour?
9. It takes two hours for a small car to go from land a to land B, and four hours for a large car to go from land B to land a. the two cars face each other from 8:30 at the same time
10. A large truck drives from city a to city B at 80km per hour. Half an hour after departure, a car chases the truck at 90km per hour. How many hours after departure can the car catch up with the truck?
11. In the granary of Party A and Party B, the grain stored by Party B is one fifth less than that of Party A. put a quarter of the grain stored by Party A into Party B, and then transport 30 tons from Party B. the two granaries have the same amount of grain. How many thousands of grain did party a store
12. Party A, Party B, Party C and Party D jointly process a batch of parts. The parts processed by Party A are half of the total number processed by others, and the parts processed by Party B are one third of the total number processed by others, The parts processed by C are 1 / 5 of the total number processed by others, while the parts processed by D are 30 less than the total number processed by the other three people?
13. The number a is 1 and 4 / 5 of the number B. how many percent more is the number a than the number B?
14. The average of a and B is 26, the average of B and C is 28, and the average of a and C is 21. Find the average of a, B and C
15. The average number of a, B and C is 44, and the ratio of a, B and C is 2 / 3:3 / 4:5 / 12?
16. 1. Yuxin primary school has 108 students participating in school science and technology group activities, of which the number of boys is 1.4 times that of girls. How many boys and girls participate in the activities? 2
17. There are 378 workers in a factory. If the number of male workers decreases and the number of female workers increases by 1 / 14, then the number of men and women is equal?
18. There are 480 male and female workers in a factory, and male workers account for 60% of the total number. Due to other tasks, some male workers have been transferred. At this time, the number of male workers accounts for 36% of the total number. How many people have been transferred? (hint: after some people have been transferred, the total number has changed. It is no longer 480, otherwise it will be a decimal.)
19. A cement plant plans to produce a batch of cement in January. In fact, it completed one third of the plan in the first ten days, 40% in the middle ten days, and another 26000 in the last ten days How many tons of cement is planned to be produced in January!
20. A batch of coal has been transported 32 times by 6 vehicles. If 2 more vehicles of the same type are added, how many times can it be transported in advance?