2. How many centimeters of metal wire does it take to weld a cuboid with a length of 6 cm, a width of 4 cm and a height of 3 cm?
3. What is the surface area of a cubic carton with a length of 10 cm? How many square decimetres?
A goldfish bowl with a length of 60 cm, a width of 50 cm and a height of 40 cm should be covered with a layer of colored paper. How many square decimetres of colored paper do you need at least?
A cow weighs 0.325 tons, and the mass of an elephant is about 22 times that of a cow. How many tons does this elephant weigh (keep the whole number)?
6. A lathe can process 14.4 parts per hour on average. According to this calculation, how many parts can a lathe like 18 work for 5 hours?
7. The width of the rectangle is 8 cm, and the length is 0.4 times of the width of 65438+. How many square centimeters is the area of this rectangle?
8. Put a batch of sweets into a small bag. If each bag is 0.98kg, it can be packed in 50 bags. If each bag is 0.28kg, how many bags can you hold?
9. Among the nine planets in the solar system, Mercury is the closest to the sun. It takes 365 days for the earth to go around the sun, which is four times longer than that of mercury, and 13 days longer. How many days does Mercury go around the sun?
10, the school bought 6 desks and 8 chairs, which cost 3,200 yuan. The price of a table is twice that of a chair. How much does it cost to use a table and a chair?
1 1. The length of a cuboid iron block is 4 decimeters, and the width and height are both 2.5 decimeters. If the iron block per cubic decimeter weighs 7.8 kilograms, how many kilograms does this iron block weigh?
12. The sum of the sides of the cube is 36 cm. How long is each side?
13. There is a piece of wood. I don't know its length. Use rope to exceed 1.5 meters. If you fold the rope in half and measure it again, it is 0.4 meters short. How long is this rope?
14. There are some pencils and erasers. As we all know, the number of pencils is five times that of rubber blocks. If an eraser is matched with three pencils, there are 10 pencils left without an eraser. * * * How many erasers do you have?
15. Animals kept in zoos are divided into large animals and small animals. Each big animal is fed 3 kg at a time, and every two small animals are fed 1 kg at a time. Animals 100 in a zoo are fed *** 100 kg each time. So, how many large animals and how many small animals are there in the zoo?
16. Pile small cubes with the same skeleton into a big cube, and then color the surface of the big cube. It is known that there are 36 cubes on both sides, so how many small cubes are there?
17, a square board, the remaining area is 180 square decimeter after sawing the 3 cm wide wood strips. What was the initial square area?
18, Xiaohong walks with her father. Dad strode and Xiaohong took small steps. Three steps for dad, five steps for Xiaohong. They started with their left feet at the same time. How many times did they lift their right feet at the same time when dad walked 100 step?
19, Dr. Wang made a house call, and left the clinic in the afternoon 1. First, he walked a flat road, then climbed a hillside to see the patients living there for half an hour, and then Dr. Wang returned by the same route and returned to the clinic at 4 pm. The speed of Dr. Wang walking on a flat road is 4 kilometers per hour, the speed of going up the mountain is 3 kilometers per hour, and the speed of going down the mountain is 6 kilometers per hour. How many kilometers did Dr. Wang walk this time?
20. Distance between the two places1800m. Both parties start from these two places at the same time. A is fast and B is slow, 12 minutes to meet in place A. If everyone walks 25 meters more per minute, then the meeting place B is 33 meters away from the place A ... How many meters does a person walk at the original speed per minute?