2. A classroom is 9 meters long and 7 meters wide. The floor is tiled and the side is 0.6 meters long. * * * How many tiles are needed?
3. Taxis in a city start at 2km, and the starting price is more than 2km in 3 yuan. Every kilometer 1.2 yuan. Aunt Zhao took a taxi from home to the park, and handed it in 10.2 yuan when she got off. How far is her home from the park? average number
Class 1, Grade 5 is divided into three groups to throw basketball. The first group 10 people, * * * shot 28 times. The second group 1 1 person, * * * shot 33 times; The third group of 9 people, * * * to 23 times. How many balls did each class throw on average?
When Xiao Liang was studying, he read an average of 6.25 pages a day for the first 4 days and 8 pages a day for the last 3 days. How many pages does Xiao Liang read every day this week?
Car A travels from place A to place B, with an average speed of 60 kilometers per hour in the first five hours and 56 kilometers per hour in the last three hours. How many kilometers does the car travel from a to b on average?
/kloc-two classes, Grade 0 and Grade 5, participated in the tree planting activities. There are 37 people in a class, and * * * planted 132 trees. Class two, 35 people, planting trees 120 plants. How many trees are planted in each class in grade five? How many trees does everyone plant in the fifth grade?
2. Sailing pioneers went out to sea to fish. Going out to sea in the first half of the month 13 days, * * * catching 805 tons; In the second half of the month, she went out to sea 14 days and fished 64 tons a day. How many tons of fish does this ship catch on average every day?
3. There are 22 boys in one class, with an average height of140.5cm; Girls 18, average height 142.5cm, what is the average height of the whole class?
4. There are 10 grandmothers in the nursing home, with an average age of 80.5 years; There are 12 grandfathers with an average age of 73.5 years. Find the average age of the elderly in the hospital. (Keep one decimal place)
Surface areas of cuboids and cubes
The rectangle is 4 meters long, 3 meters wide and 2.5 meters high. How many square meters is its surface area? (Calculated in two ways)
A rectangular iron box, length 18cm, width 15cm and height 12cm. How many square centimeters of iron does it take to make this iron box?
How many square centimeters of cardboard do you need to make a rectangular carton with a length of 6 cm, a width of 5 cm and a height of 4 cm?
A rectangular wooden box, length1.2m, width 0.8m and height 0.6m.. How many square meters of planks does it take to make this wooden box? What if this wooden box is not covered properly?
A cubic wooden box without a lid, with a side length of 0.8 meters. How many square meters of boards do you need to make this wooden box?
A classroom is 8 meters long, 6 meters wide and 3.5 meters high. The walls and ceiling of the classroom need painting. The area of doors, windows and blackboards is 22 square meters, with an average of 0.25 kg of paint per square meter. How many kilograms of paint does it take to paint this classroom?
Volumes of cuboids and cubes
1, fill in the blanks.
The volume of the eraser is about 8 (), and the volume of the recorder is about 20 ().
The volume of cargo container is about 40 ()
2. Connection: The volume of the school platform is 24 cubic centimeters.
The volume of the schoolbag is 24 cubic meters.
The capacity of the carbon ink box is 24 cubic decimeters.
3. A rectangular steel plate is 2.2m long, 0.5m wide and 0.0 1m thick. How many cubic decimeters is its volume?
4. A cuboid bunker is 8 meters long, 4.2 meters wide and 0.6 meters deep, and the weight of sand per cubic meter is 1.75 tons. How many tons of sand does it take to fill this bunker?
5. Forging a cubic billet with a length of 6m into a rectangular steel piece with a width of 3m and a height of 2m. How long is this steel?
6. A cuboid iron block is 2.4m long,1.6m wide and 4m high. If the surface is coated with antirust paint, use 2.3 grams per square decimeter. * * * How many grams of antirust paint do you need?
7. Car fuel tank, 8 cm long, 5 cm wide and 4 cm high. How many liters of gasoline can this tank hold?
8. A rectangular water tank, measured from the inside, is 12 decimeter long, 6 decimeters wide and 5 decimeters deep. How many milliliters of water can this tank hold?
9. The fuel tank of the walking tractor is 3 decimeters long, 2.3 decimeters wide and 1.6 decimeters deep. How many liters of diesel can this tank hold? The weight of diesel oil per liter is 0.82 kg. How many kg of diesel oil is loaded? (Numbers are reserved as integers)
10. Fill in the actual figures in brackets.
A small bottle of mercuric chloride is () ml. A bottle of ink is () ml.
The volume of a car (or tractor) fuel tank is () liters.
1 1. Formula: (1) A rectangle is 3 decimeters long, 2 decimeters wide and 1 decimeter high. What is its surface area? What is the volume?
(2) The length, width and height of a cuboid are 6 decimeters. What is its surface area? What is the volume?
15. Fill in the appropriate unit of measurement in ().
(1) The surface area of the chalk box is about 6 (). (2) The volume of a matchbox is about 14 ().
(3) A swimming pool, which can accommodate up to 3,000 people ().
16, judging.
(1) Cubes with a side length of 6 decimeters have the same volume and surface area. ()
(2) A cube with a surface area of 6 square meters and a volume of 1 m3. ()
17, People's Leather Products Factory uses synthetic leather to make rectangular boxes, which are 0.9 meters long, 0.6 meters wide and 0.4 meters high. How much synthetic leather does it take to make a box?
18, Liming Carton Factory made 0.6m long cubic cartons. How much cardboard does it take to make a carton? What is the volume of this carton?
19, Yongfeng Water Pump Factory planned to manufacture 1575 pumps in 25 days, but actually manufactured 12 more pumps every day than originally planned. According to this calculation, how many days will it take to complete the original production task?
Factor and multiple
1. There are 320 apples, 240 oranges and 200 pears. How many copies of the same gift can you share with these fruits at most? How many apples, oranges and pears are there in each gift?
2. There are 27 boys and 8 girls in Class A of Yuxin Middle School. Let's go boating together (no more than 6 students per boat). Please calculate how many boats you should rent.
3. The school is rehearsing group calisthenics, and the team is required to be 12, 15, 18 and 24 lines, all of which can be rectangular. How many people do you need to attend the rehearsal of group calisthenics?
Significance and nature of fractions
A fraction is, if its numerator is reduced by 12, how much should the denominator be reduced to keep the size of this fraction unchanged?
A piece of cloth is used to make coats and trousers. How much is left?
1. The engineering team built a section of highway, kilometers on the first day, kilometers on the second day, and kilometers left. How many kilometers is this road?
2. The fifth-grade students collected more kilograms of scrap iron than the third-grade students. How many kilograms of scrap iron do these two grades collect?
A cargo ship sailed kilometers in the first hour, kilometers in the second hour and kilometers in the third hour. How many kilometers did the cargo ship sail in the third hour?
4. Build a canal. On the first day, the full length will be built, and on the second day, the full length will be built. How many parts of the whole length need to be repaired?
Surround a flower bed by the wall. The fence around the flower bed is 46 meters long. Find out the area of this flower bed.
Two people, A and B, travel from A to B at the same time. A arrives 3 hours earlier than B, A travels 10 km per hour, and B travels 8 km per hour. A It will take several hours to complete the journey.