2. Schools should paint classrooms. It is known that the length, width and height of the classroom are 10m, 8m and 3m respectively, and the area excluding doors and windows is12.5m. If it costs 5 yuan per square meter to paint, how much will it cost to paint this classroom?
3. The rectangular biscuit box is 12cm long, 8cm wide and 14cm high. If you want to put a circle of trademark paper around (not up and down), what is the minimum area of this trademark paper?
4. Dig a rectangular pit with a length of 60m, a width of 40m and a depth of 50cm at the construction site. How many square meters of soil will be dug?
5. The park should build a fence with a length of 15m, a thickness of 24cm and a height of 3m with cube bricks with a length of 3dm. How many bricks does this fence need?
6. A train car, measured from the inside, has a length of 13m, a width of 2.7m, a coal height of 1.5m and a coal weight of 1.33t per cubic meter. How many tons of coal is there in this train car?
7. Forging a cuboid iron block with a 4dm long cuboid iron block. The cross-sectional area of this cuboid is 0.2 square decimeter. What's its length?
8. The supermarket should install an angle iron on both sides of a glass cabinet 3 meters long, 0.6 meters wide and 0.8 meters high. * * * How many meters of angle iron do you need?
A rectangular swimming pool is 50 meters long, twice as wide and 2.5 meters deep. Now, how many square meters of tiles do you need to put on the periphery and bottom of the swimming pool?
10, an irregular stone completely invaded a rectangular water tank with a bottom area of 280 square centimeters, and the water level rose by 2 centimeters. What is the volume of this stone?
1 1, the sum of the sides of a cuboid and a cube is equal. It is known that the length of a cuboid is 10 cm, the width is 8 cm and the height is 6 cm. What is the side length and surface area of a cube? What is the volume?
12. The car fuel tank is 3.5 decimeters long, 2.5 decimeters wide and 3 decimeters high. How many square decimetres of iron do you need to make this fuel tank? If 1 liter of gasoline weighs 0.8kg, how many kilograms of gasoline can this tank hold?
13. Melt a cubic iron block with a side length of 8 decimeters to become a cuboid iron block with a bottom area of 32 square decimeters. What's the height in decimeters?
14. A rectangular water tank, 50 cm long, 30 cm wide and 34 cm deep. Now a metal part is immersed in water. At this time, the water depth of the water tank is 40 cm. What is the volume of this part?
15, a rectangular glass container, measure the length and width of 2dm from the inside, pour 5.5L of water into the container, and then put an apple into the water. At this time, the water depth in the container is15cm. How big is this apple?
16. A fence with a length of 15m, a thickness of 24cm and a height of 3m will be built in the south of the park. If 525 bricks are used per cubic meter, how many bricks are used in this fence?
17. The furniture factory ordered 500 square logs, each with a cross-sectional area of 24 square decimeters and a length of 3 meters. How many cubic meters is this wood?
18, rectangular glass fiber reinforced plastic, 8 dm long, 6 dm wide, 4 dm high and 2.8 dm deep. How many liters of water will the water tank overflow if a 4 dm long cubic iron block is put in?
19. The newly-built basketball stadium should be paved with a 3 cm thick wooden floor. It is known that the stadium is 36 m long and 20 m wide. How many cubic meters of wood should be paved?
20. There is a rectangular piece of paper, 70 cm long and 50 cm wide. If you want to cut into several squares of the same size, without any surplus, what is the maximum side length of the cut small square?
2 1. A team has 48 boys and 36 girls. Now boys and girls line up separately. How many people in each row can make the number the same? How many rows are there for boys and girls at this time?
22、 ? Roses are watered every four days, and Clivia is watered every six days. Aunt watered the roses and Clivia at the same time today. In a few days, she will water two flowers at the same time.
The starting points of the 23 rd and 3 rd roads are the same as those of the 5 th road. The 3 rd road runs every 6 minutes and the 5 th road runs every 8 minutes. After the two cars start at the same time, how many minutes will it take at least before the two cars start at the same time for the second time?
24. A square towel can be made into a square towel with a side length of 8 cm or a square towel with a side length of 10 cm, and there is no redundancy. How many centimeters is the side length of this square cloth at least?
It takes Xiaolin 25 minutes to go home from school, and Xiaohong 15 minutes to go home from school. If they walk at the same speed, who is farther from school?
26. (1) An annular iron sheet with an outer circle radius of 7 cm and an inner circle radius of 0.5 decimeter. What is the area of this ring?
(2) The rectangle is 8 cm long and 4.56 cm wide. What is the area of a circle with the same circumference as this rectangle?
27. The school held a singing contest and won several first, second and third prizes. Results Three fifths of the total winners won the first and second prizes, and nine tenths won the second and third prizes. What percentage of the total number of winners won the second prize?
28. A fraction is 1 after adding one of its decimal units, and 0.875 after subtracting one of its decimal units. What is the score?
29. A glass of juice, Xiao Ming drank 1/3, then filled it with water, drank half of it, filled it with water and drank 1/4, and continued to fill it with water. Finally, he drank the diluted juice in one gulp. How much juice and water did Xiaoming drink?
30. A rope is 3 1.4m long. Which is bigger, enclosing a rectangle or a square or a circle? (Group discussion, discuss the size of the area)
3 1, (1) The circumference of a semicircular piece of paper is 10.28 decimeter. What's its square decimeter?
(2) The perimeter of a semicircular flower bed is102.8m. What is its area?
32, a pile of goods 10 tons, if transported by a truck with a load of 4 tons, how many times at least?
33. The sum of three consecutive natural numbers is 99, and the middle number is X. Can you make an equation to find the value of X? What are the other two numbers? Fragrance and radiation protection
34. There are two packaging specifications for a beverage. The capacity of a large bottle is 1.5 liter, which is three times that of a small bottle. The unit price of small bottles is 1.8 yuan, which is cheaper than that of large bottles. What is the capacity of a small bottle? What is the unit price of the big bottle?
35. Teacher Wang distributed 25 compositions and 39 math books to the students in the first group on average. The result is 1 composition, 3 math books. How many students are there in the first group at most?
36. A rectangular piece of paper, length16cm, width12cm. If you cut it into squares of the same size, how many squares can you cut it? What is the side length of each square?
37. Students in a class have more than 3 students in 7 rows and less than 4 students in 8 rows. How many people are there in this class at least?
38. Students in Class Five (1) do exercises. Row 8 is missing 1 person, 10 is missing 1 person. How many people are there in this class at least?
39. For a 20-meter rope, use 12 meter for the first time, use the whole length for the second time, and use a fraction of the whole length for the first time?
40. A hotel moved 5 cases of beer and 60 bottles of beer, which were distributed to 4 tables on average. How many boxes are each table divided into? How many bottles per table on average?
4 1, a pile of coal ***5 tons, shipped in 8 times, how many tons on average each time? What is the average weight of each batch of 5 tons?
42. There are 24 seats in the first row of the cinema. Mother took her daughter to the movies, and mother and daughter sat together. How many different ways to sit in the same row?
43 43. 100 kg of peanuts can squeeze out 35 kg of peanut oil. How many kilograms of peanut oil can be squeezed out per kilogram of peanut on average? How many kilograms does it take to squeeze out 1 kg peanut oil?
44. Three masters, Li, Wang and Chen, made the same parts. Li Shifu made three in four hours, Master Wang made seven in 10 hour and Master Chen made 17 in 20 hours. Who does it faster?
45. As the saying goes, "Shop around", Xiao Min went to the wholesale market to buy pencils, ran three booths in a row, and found that booth A 5 yuan bought eight; B spread 5 to 3 yuan; At booth C, 7 yuan buys 8 for 2. Please help Xiao Min find out which one should choose the cheaper purchase.
46. The same towel is priced at 3 in 5 yuan in supermarket A, 4 in 7 yuan in supermarket B and 5 in 8 yuan in supermarket C ... Which supermarket is the cheapest for this towel? Which supermarket is the most expensive?
47. Three people are reading a 240-page book. A has not seen it, b has not seen it, and c has not seen it. Who reads the most pages?
48. Three masters, Wang, Zhang and Li, work in the same workshop. Master Wang makes 10 in 3 hours, master Zhang makes 12 in 4 hours, and makes 16 in 5 hours. How long does it take each person to make a part on average? Who is the most efficient?
49, two cars from a to b at the same time, the line is completely long, a car 10 hour, b car 15 hour. Two hours later, what fraction of the total length are the two cars apart?
50. The master and the apprentice made a batch of parts together. After the master finished this batch of parts, how many more parts did the master make than the apprentice?
5 1, a piece of iron is 4 square meters. After the first cut and the second cut, how much iron sheet is left?
52. A ribbon runs out of rice, and the rest is longer than the used rice. How many meters is this belt?
53. A pile of yellow sand is 30 tons. A car can be shipped every time, and B car can be shipped every time. How much can two cars carry at a time?
54. The air-conditioning factory completed the annual planning task in the first half of last year, and the same number was completed in the second half and the first half of last year. How much did the air-conditioning factory actually exceed the annual planned task last year?
55. Uncle Zhang collected several tons of watermelons and sold them on the first day and the next. How much is left?
56. Did Li Guang Agricultural Machinery Factory complete the annual tasks in the first half of last year and the second half? What percentage of the annual plan is exceeded?
57. One hectare of land is planted with soybeans and cotton, and the rest is planted with corn. What is the proportion of corn planted in this land?
58. A rectangle and a circle have equal perimeters. It is known that the length of a rectangle is 10 cm and the width is 5.7 cm. What is the area of a circle?
As shown in the figure, cut the largest right triangle from a semicircular steel plate with a diameter of 4 decimeters. What is the area of this triangle?
60. There is an oil drum with a diameter of 60 cm, which rolls from one side of the foot of the wall to the other. The width of the warehouse is10.02m.. How many times do you need to roll?
6 1. The minute hand of the big clock on the roof of the hotel is 0.6 meters long, so how many decimeters did the needle tip of the minute hand walk from noon 12 to 3 pm?
62. Uncle Zhang crossed a bridge with a length of 1099 meters by bike. Given that the outer diameter of the wheel is 70 cm, how many turns will the wheel make when crossing the bridge?
63. Round fish pond, perimeter 1 88.4m, now widened1m.. How many square meters is the widened area?
64. Around a circular flower bed with a diameter of16m, there is a gravel road with a width of 2m. What is the area of this gravel road?
65. The circumference of a semicircle is 30.84 decimeters. How many square decimetres is the area of this semicircle?
66. After a circle is divided into several equal parts, it can be made into a rectangle with a circumference of 20.7 decimeters. What is the area of this circle?
67. The radius of the outer wheel of a bicycle is 40 cm. How many turns does it take for a wheel to cross a street1256m long?