1, a cube, its side length is 5 decimeters, and it is known that each cubic decimeter weighs 0.4 kilograms. How much does this building block weigh?
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2. Each bottle of cod liver oil drops is 10 ml. There is now 0.4 liter of cod liver oil. How many bottles can you hold?
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A brick is 24cm long, half wide and 6cm thick. What is its volume? What is the surface area?
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The processing factory wants to produce a batch of cuboid recorders. It is now measured to be 60 cm long, 20 cm wide and 15 cm high. How many square meters of cloth does it take to make 2500 such tape recorders? (No bottom)
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Application problems (2)
1, find the surface area and volume of a cuboid with a length of 7 decimeters and a width of 2 decimeters.
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2. Find the surface area and volume of a cube with a length of 5 decimeters.
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Use a car with a cuboid trunk to transport coal. From the inside, it is 3 meters long, 2.5 meters wide and 0.4 meters high. The weight of coal per cubic meter is 1.4 tons. How many tons of coal can five identical cars carry?
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4. Fifty math books are arranged into a cuboid with a length of 18cm, a width of 13cm and a height of 25cm. What is the average volume of each book?
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5. How many square decimeters does a carpenter use to make a 5-decimeter-long cubic wooden box without cover?
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6. Forging a cubic iron block with a side length of 10 cm into a rectangular iron bar with a width of 5 cm and a height of 10 cm. How long is this iron bar? (Equation solving)
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Application problems (3)
1. How many square decimeters of iron does it take to process a cuboid tin oil drum with a length of 2.5 decimeters, a width of 1.6 decimeters and a height of 3 decimeters?
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2. The school should dig a rectangular bunker, 4 meters long, 2 meters wide and 0.4 meters deep. How many cubic meters of yellow sand do I need to fill?
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3. How many square decimeters of glass do you need to make a rectangular fish tank with a length of 8 decimeters, a width of 3 decimeters and a height of 5 decimeters?
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4. Forging the 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)
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5. A cuboid oil drum, 8 cm long, 2 cm wide and 6 cm high. If each liter of oil weighs 0.72 kilograms, how many kilograms can it hold?
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6. What is the surface area of three cubes with a side length of 8 cm, which are combined into a cuboid?
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7. Stick tiles in a rectangular reservoir with a length of 20m, a width of 8m and a depth of1.5m. The tiles are square with a side length of 0.2m How many tiles do you want?
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Application problems (4)
1. The sum of all sides of the cube is 84 cm. How many cubic centimeters is its volume? How many square centimeters is the bottom area?
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2. Make a cuboid iron drum (without cover), with a length and width of 5 mm and a height of 6dm. How many square decimetres of tin do you need at least?
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A rectangular glass fish tank is 6 decimeters long, 4.5 decimeters wide and 3.8 decimeters high. What is the volume of the fish tank? The glass on its bottom and right side is broken. How many square decimetres of glass does it take to repair this fish tank?
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4. Cut a square with a volume of 1.28dm3, and the bottom is a square with a side length of 8cm. How long should it be cut? (Equation solving)
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5. Saw a piece of wood with a length of 3.6m and a width of 2.4m, and nail it into a cubic wooden box with a length of 3dm. How many pieces can I nail at most?