2. A circular iron ring with a diameter of 40 cm. How long does it take to make such an iron ring?
The tallest animal in the world is giraffe. A giraffe is 6 meters high, which is higher than an elephant 1/2. How long is this elephant?
4. Grade four students in a school 150 students. The number of students in grade five is 2/3 of that in grade four, and the number of students in grade five is 4/5 of that in grade six. How many students are there in the sixth grade? 49. Make a triangle with a 36 cm long iron wire. The ratio of the three sides of a triangle is 3: 5: 4. How many centimeters are the three sides of a triangle?
5. A medicinal liquid, which is prepared from water and medicinal powder at the ratio of100:1. Now we need to prepare 505 kilograms of this potion. How many kilograms of water and powder do you need?
6. The surface of a football is surrounded by 32 pieces of black pentagonal leather and white hexagonal leather. The ratio of black leather to white leather is 3:5. How many pieces of leather are there in each color?
7. I hope that the fourth, fifth and sixth grades of primary school will donate books to the school library. I plan to donate 2,500 books. There are 350 students in grade four, 440 students in grade five and 460 students in grade six. How many books should be donated in each grade according to the number of people?
8. There are 280 employees in a factory, of which the ratio of male to female is 5:9. How many people are there in this factory?
9. The ratio of degrees of two acute angles of a right triangle is 2:7. What are the degrees of these two acute angles?
10, the perimeter of the rectangle is 120 cm, and the length-width ratio is 3: 2. How many centimeters is the length and width of a rectangle? How many square centimeters is the area of a rectangle?
1 1. Minute length of wall clock15cm. How many centimeters does the minute hand tip move after 1 hour?
12, a circular iron ring with a diameter of 40 cm. How long does it take to make such an iron ring? 58. The wheel radius of a bicycle is 4 decimeters, and the wheel rotates 100 times per minute. How many minutes does it take to cross the 2512m bridge?
13, a rectangular piece of paper, 60 cm long and 40 cm wide. Cut out the biggest circle with this paper. What is the circumference of this circle?
14. The outer diameter of bicycle tire is 70cm. It takes 10 minutes for Miss Li to go to the library by bike. If the wheel rotates 200 times per minute, how many meters is the distance from home to the library?
15, acrobatic unicycle, rolled 250 times on the runway of 3 14 meters. What is the wheel diameter of this acrobatic unicycle?
16, the diameter of the bicycle outer wheel is 6 decimeters, if the bicycle wheel rotates 100 times per minute on average. How many minutes does it take Li Ming to cross a1884m bridge by bike?
17. The outer diameter of bicycle tires is 7 decimeters. If it turns 100 times per minute, how many minutes does it take to cross a 3300m road now? (Numbers are reserved as integers)
18. I bought 4/5 tons of rice in the canteen. I ate 1/3 in the first week and 1/5 tons in the second week. How many tons of rice did * * eat in two weeks?
19. Tianyuan Computer City planned to sell 3,500 computers in May, but actually sold more than originally planned 1/5. How many computers did it actually sell in May?
20. Xiaohua has read 72 pages of books. On the first day, he read 1/3, and the next day, he read 1/4. How many pages are left?
2 1, teachers and students in grade 6 donated 8,000 yuan to Sichuan disaster area, and the donation in grade 5 was less than that in grade 6 1/5. How much did you donate in the fifth grade?
22.( 1) The original price of a TV set was 1600 yuan, but now the price has been reduced 1/8. How much has it decreased?
(2) The original price of a TV set is 1.600 yuan, and the price is now reduced to 1/8. What's the current price? (3) The original price of a TV set was 1.600 yuan, but now the price has increased 1/8. What's the current price?
23. To build a 480m-long expressway, the total length of 1/4 has been completed. How many meters are left to be repaired?
24. Science and technology books in the school library 1080, and literature and art books are 2/9 more than science and technology books. How many literary books are there?
25. bright primary school's electricity consumption was 840 kwh in September, and it was less in June than in September112. How many kilowatt hours have you saved?
26. Teacher Zhang has 270 China stamps. He collected fewer foreign stamps than China stamps 1/9. How many foreign stamps are there?
27. A wire is 10 meter long. First cut1/5m, second cut1/5m, how many metres are left?
28. In the sixth grade, 36 students participated in math interest groups. The number of Chinese group is 5/6 of that of math group, and the number of sports group is 4/3 of that of Chinese group. How many people are there in the sports team?
29. Weld a circular iron ring with a length of 126 cm. What is its radius? Ignore connectors and keep integers)
30. Hongxing Primary School used 483 kWh of electricity in June 5438+ 10, saving18 compared with September. How many kWh was used in September?
3 1. Last year, the total grain output of Toyota Village reached 1.8 million tons, an increase of 1/5 over the previous year. What was the total output of the previous year?
32. A primary school spent 60,000 yuan on books, saving 1/4 compared with the original plan. How much did you originally plan to invest?
33. A conference room is paved with square tiles with a side length of 2/5 meters, and exactly 800 tiles are used. What is the area of the conference room?
34. After a livestock farm sold 3/8 beef cattle, there were 250 left. How many beef cattle are there in this livestock farm?
35. A factory used 480 tons of water in June 5438+ 10, saving19 compared with the original plan. How many tons of water is planned for June+10 in 5438?
There are 120 apricot trees in the orchard, which is 2/5 of the number of pear trees and 5/8 of the number of apple trees. How many apple trees are there?
37. The typist typed a manuscript, and typed 12 on the first day and 13 on the second day. The pages typed in two days account for 5/ 12 of this manuscript. How many pages are there in this manuscript?
38. There is a pasture with 56 cows. The number of cattle is less than that of sheep 1/5. How many sheep have you raised?
39. A car traveled 60 kilometers in 2/3 hours. According to this calculation, how many kilometers does this car travel per hour?
40. As shown on the right, the area of a triangular vegetable field is 8/ 15 square meters, and the bottom is 4/5 meters. Find H.
4 1. Store packed in plastic bags120kg candy. If each bag is 1/4kg, how many bags can these sweets be packed?
42. A car travels 96 kilometers in 8/5 hours. How many kilometers per hour do you drive on average?
43. If you ship a batch of goods, you can ship the goods of 1/5 every day. How many days can you ship 4/5 of this batch of goods?
44. Xiaohua goes to school by bike 1/3 hours, the whole journey is 3/ 14. Walking a fraction of the whole journey every hour?
45. Seven eighths of a number is 14. What's this number?
46. Party A and Party B made 150 parts in 3/2 hours. Party A produces 60 parts per hour. How many parts does Party B produce per hour?
47. Students visit Xiangjiang Wildlife Park. An adult ticket is a 50 yuan, and a child ticket is 65438+ 0/2 of the adult ticket price. How many children tickets can 200 yuan buy?
48.( 1) The original price of a TV set was 1600 yuan, and now the price is reduced 1/8. How much has it decreased?
(2) The original price of a TV set is 1.600 yuan, and the price is now reduced to 1/8. What's the current price?
(3) The original price of a TV set was 1.600 yuan, but now the price has increased 1/8. What's the current price?
49. The sixth grade teachers and students donated 8,000 yuan to the Sichuan disaster area. The donation of grade five is less than that of grade six 1/5. How much did the fifth grade donation cost?
50. Tianyuan Computer City planned to sell 3,500 computers in May, but actually sold more computers than originally planned 1/5. How many computers did it actually sell in May?