1. How long does it take to make 10 8 cm long cubic iron frames? 2. Make an iron box with iron sheet so that its length, width and height are 1.8 decimeter, 1.5 decimeter and 1.2 decimeter respectively. How many square meters does it take to make such an iron box? 3. How many square meters of glass does it take to make a 3-minute uncovered cube glass fish tank? Our school will paint the classroom, which is 8 meters long, 7 meters wide and 3 meters high. After deducting the area of doors, windows and blackboards, it is known that 5 yuan painting costs per square meter. How much does it cost to paint a classroom? A commodity box is a cube with a side length of 6 cm. What is the maximum area of a box with a trademark? 6. The length, width and height of woodcut are 2.8 decimeters, 1.5 decimeters and 2.2 decimeters respectively. How many square meters of wood carving does it take to make five such drawers? 7. There is a fish pond, with a length of 18m, a width of 12m and a depth of 3.5m It is necessary to coat a layer of cement around the fish pond to prevent water seepage. If 5 kilograms of cement slurry is used per square meter, how many kilograms of cement does a * * need? 8. The processing factory will process a batch of TV sets. (No bottom) Each TV is 60 cm long, 50 cm wide and 55 cm high. How many square meters of cloth does it take to make 1000 sets? 9.24 rectangular iron chimneys, each 2m long, 4m wide and 3m high. How many square meters of iron do you need? 10, rectangular goldfish bowl, 8 cm long, 5 cm wide and 6 cm high. Accidentally, the glass in front was broken, and the glass area for maintenance was (). How many cubic decimeters are the length, width and height of a rectangular box? 2. A cuboid bunker is 4m long, 2m wide and 0.5m deep. If the yellow sand weighs 1.4 tons per cubic meter, how many tons does it weigh? 3. There is a kind of rectangular steel, which is 2 meters long and the cross section is a square with a side length of 5 centimeters. Each cubic decimeter of steel weighs 7.8 kilograms. How much does this square steel weigh? 4. What is the volume of a cuboid with a base area of 30 square decimeters and a height of 3 meters in cubic decimeters? 5. Writing head 1.3m, 0.6m wide and 0.8m high. How much space does 20 such desks need? 6. A 5-meter-long cube fish tank is filled with water. Pour water into a rectangular fish tank with a bottom area of 48 square decimeters and a height of 6 decimeters. How deep is the water in the fish tank? 7. A cubic water tank with a side length of 8 decimeters can hold 490 liters of water. Pour water into a cuboid water tank with a length of 10 decimeter, a width of 7 decimeters and a height of 8 decimeters. What is the depth of the water tank? 8. Forging a cubic blank with a length of 8 cm into a rectangular steel plate with a length of 16 cm and a width of 5 cm. How thick is this steel plate? (excluding losses) 9. A cuboid oil drum with a bottom area of 18 square decimeter can hold 43.2 kilograms of oil. If each liter of oil weighs 0.8 kg, what is the height of oil in the oil drum? 10, a rectangular iron sheet, 30cm long and 25cm wide. Cut a square with a length of 5cm from each of the four corners to make a box without a lid. How much iron is used in this box? What is its volume? 1 1. Cut a rectangular wooden board with a length of 26dm, and cut a square with a side length of 3 m at the four corners to make a cuboid container with a volume of 840 cubic decimeters. What was the initial width of this board? 12. A rectangular swimming pool is 60m long, 30m wide and 2m deep. How many square meters is this swimming pool? Draw the water level line with red paint along the inner wall of the swimming pool at 1.5 meters. How long is this line? Now the water in the swimming pool just reaches the water level. What's the volume of water in the pool? 13. A rectangular glass jar, measured from the inside, is 40 cm long, 25 cm wide and 12 cm deep. After a stone is immersed in water, the water surface rises to 16 cm. Find the volume of the stone? Volume and surface area: 1.80 square, stacked into a cuboid with a length of 2m, a width of 2m and a height of1.5m.. What is the average volume of each square? How many cubic decimeters? 2. What is the volume and surface area of three cubes with a side length of 8 cm, which are combined into a cuboid? The furniture factory ordered 500 square logs, each with a cross-sectional area of 25 square decimeters and a length of 3.8 meters. What is the volume of these logs? 4. Put two cubes with side length of 1.5 decimeter into a cuboid. What is the volume and surface area of this cuboid? 5. The surface area of a cuboid is 156 square decimeter, the bottom area is 30 square decimeter, and the perimeter of the bottom surface is 32 decimeter. What is the volume of this cuboid? 6. How many cuboid blocks with a length of 8cm, a width of 12cm and a height of 5cm can be sawed into cubes with a length of 2cm? 7. A rectangular piece of wood with a square bottom is 5 meters long. Cut into 4 sections to increase the surface area by 36 square meters. What is the volume of this cuboid? Fractional application problem 12 candy, evenly distributed to 3 people, how many candy does each person get? Five apples are divided equally among eight people. How many apples does everyone have? How many apples can everyone get? There are 23 boys and 25 girls in Grade Five. What is the percentage of girls to boys? What is the percentage of boys and girls in this class? Divide 3 tons of rice into 5 parts on average. How many tons per serving? How much is the rice per serving? There are 280 comic books and 140 literature books in the school library. How many comic books are there? Which part of a comic book is a literature book? There are 24 students in Class 3, Grade 5, Shengli Primary School, and 24 students are unqualified 12. What percentage of students meet the standard in the class? Master Wang processes 34 parts in 6 hours, and Li Shifu processes 40 parts in 7 hours. Who is more efficient? A book 185 pages, 95 pages have been read. What percentage of this book have you read? What percentage of unread pages are in this book? There are 25 sika deer and 5 giraffes in the zoo. How many times the number of sika deer is that of giraffe? How many giraffes are there more than sika deer? There is a piece of wood. Cut off 2/5 meters for the first time and 7/ 10 meters for the second time, leaving 4/ 15 meters. How long is this piece of wood? There are some fruit trees planted in the orchard, among which litchi accounts for 12/27, longan accounts for 12/25, and the rest are bayberry. What's the percentage of Myrica rubra? Mom bought 600 grams of oil. On the first day, she used 1/3, and the next day, she used 1/4. How much oil is left? M: Students in our class 1/4 join the choir. Language: 2/8 students in our class participated in the model airplane group. Female: Eight students in our class took part in the sports group. There are 40 students in this class. Which group has fewer students? What are the numbers of the other two groups? A cuboid reservoir is 8 meters long, 5 meters wide and 3 meters deep. What is the area of this reservoir? How many cubic meters of water can it hold at most? Xiaoming's father made a cube fish tank with a length of 6dm out of glass. How many square meters of glass does it take to make this fish tank? Xiaoming injected 144L water into the fish tank. What is the height of the water? In the last four quarters, Machine Tool Plant has completed the annual tasks of 1/6, 1/5, 4/ 15 and 7/ 10 respectively. How many points did you exceed last year's annual plan? A batch of steel was delivered from the construction site, including 2 tons of round steel, 2/5 tons of square steel and other steel 1/7 tons. How many tons is this batch of steel? Find a two-digit number, and exchange the ten-digit number with the one-digit number, and the two-digit number is still a prime number. Write two such two-digit numbers. Students from Class 5, Grade 5 walked into life and lined up to perform. 12 people or 16 people in each row. It is understood that there are less than 50 students in this class. Can you figure out how many students there are in this class?