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 Cement should be coated around the fish pond to prevent water seepage. If 5 kilograms of cement 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. I accidentally broke the front glass, and the matching area of the glass during maintenance was ().

Volume calculation

1, a rectangle is 4 decimeters long, 2.5 decimeters wide and 3 decimeters high. How many cubic decimeters is its volume?

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. The rectangular iron sheet is 30 cm long and 25 cm 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 squares with a bottom length of 3 m at 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?

Comprehensive exercises of volume and surface area

1, 80 squares are piled up 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?

Fraction application problem

1., 12 sweets, distributed to 3 people on average, how many sweets does each person get?

2, 12 candy, distributed to three people on average, how many of these sweets does each person get?

Five apples are distributed to eight people equally. How many apples does everyone have? How many apples can everyone get?

4. In the fifth grade, there are 23 boys and 25 girls. What is the percentage of girls to boys? What is the percentage of boys and girls in this class?

6. Divide 3 tons of rice into 5 parts on average. How many tons per serving? How much is the rice per serving?

7. 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?

8. The number of students in Class 3, Grade 5 in Shengli Primary School who reached the standard was 24, and the number of students who failed to meet the standard was 12. What percentage of students in this class have reached the standard?

9. Master Wang processes 34 parts in 6 hours, and Li Shifu processes 40 parts in 7 hours. Who is more efficient?

10. A book has 185 pages. After reading 95 pages, what percentage of this book have you read? What percentage of unread pages are in this book?

1 1. There are 25 sika deer and 5 giraffes in the zoo. How many times are sika deer more than giraffes? How many giraffes are there more than sika deer?

12. 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?

12. Some fruit trees are planted in the orchard, among which litchi trees account for 12/27, longan trees account for 12/25, and the rest are Myrica rubra. What percentage of Myrica rubra accounts for the total?

13. Mom bought 600g of oil, and used 1/3 on the first day and 1/4 on the second day. How much oil is left? ,

Comprehensive exercise

1.m: Students in our class 1/4 joined 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 8m long, 5m wide and 3m 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?

5. 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?

6. A batch of steel was sent 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 of steel are there?

7. look for it

A two-digit number, the number of ten digits is exchanged with the number of one digit, and the two digits obtained are still prime numbers. Write two such two-digit numbers.

8. Step into life

Students from Class Five, Grade Five lined up to perform. There are 12 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?

1. Cube is also called (), which is a cuboid of ().

The greatest common divisor of 2.4 and 28 is (), and the least common multiple is ().

3. The least common multiple of three prime numbers is 165, and these three numbers are ().

4. A number has only () two divisors, and this number is called a prime number.

5. Divide () into several parts on average, and the number representing such a part or parts is called a score.

7. Fill in the appropriate score in () below.

25cm = () m 15000m2 = () ha。

1 ton 600kg = () ton 1 10 second = () minutes.

1400 ml = () 8 months = () years.

125 cubic centimeter = () liter = () cubic decimeter.

8. put ">"

9. True score () False score.

Second, the judgment (6 points)

1. False scores are all greater than 1. ( )

2. The least common multiple of two numbers must be divisible by these two numbers. ( )

3. The product of prime number and prime number is still prime number. ( )

4. All even numbers are composite numbers. ( )

5. The commutative law and associative law of integer addition are also applicable to fractional addition. ( )

Three. Choice (8 points)

1. 1-20 has () which is both complex and odd.

A. 1

2. Put 5g of sugar into100g of water, and sugar accounts for () of sugar water.

There is ().

A.5 B.6 C.7

A. greater than B. less than C. equal to

Four. Calculation (3 points for each question, *** 12 points)

Verb (abbreviation of verb) solves the following equation (3 points for each question, *** 12 points).

③0.4×6+3x=4.8 ④9x-2.7÷0.03=0

Six, application questions (5 points per question, ***40 points)

1. There are 49 students in one class, including 24 boys. What percentage of boys are in this class? What percentage of girls are in the class?

M, how long is the third paragraph?

3. There is a swimming pool with a length of 25m, a width of 12m and a depth of1.4m. How many square white tiles do you need?

The second week is 0.7 kilometers more than the first week. How many kilometers will it take to complete?

This cuboid reservoir has 2 100 cubic meters of water. This reservoir is 50 meters long and 20 meters wide. How deep is it?

6. The school sent 7.6 cubic meters of sand and spread it in a bunker 5 meters long and 3.8 meters wide. How thick can it be laid?

7. A water conservancy engineering team repairs ditches 125m every day for the first four days and 134m every day for the last three days. How many meters of canals does this engineering team build on average every day?

8. The shape of the cornfield is shown on the right. How many square meters is its area?

1. Fill in the blanks (65438+ 0 for each blank, ***25)

1, seven numbers 1, 2,3,4,21,19,53,87, () is a prime number, () is a composite number, () is both an odd number and a composite number, and () is neither a prime number nor a composite number.

2. The largest two-digit number divisible by 2, 3 and 5 at the same time is (), and its prime factor is ().

3. Xiaohong makes tea for 2 minutes, boils water for 20 minutes, washes teacups for 2 minutes, 15 minutes buys tea and makes tea for 3 minutes. Xiaohong needs at least () minutes.

4.A, B and C are all prime numbers, number A = A× B, number B = A× B× C, the greatest common divisor of numbers A and B is (), and the least common multiple is ().

5. 10.75 cubic decimeter = () cubic decimeter () cubic centimeter

7.5 cubic decimeter = () liter = () ml

6. The total side length of a cube is 36 decimeters, its surface area is () square decimeters and its volume is () cubic decimeters.

7, 500 ml of medical alcohol per bottle, 120 bottles of alcohol () liter, if there is 3.5 cubic decimeter of alcohol, you can put it in the bottle ().

8. The base area of a cuboid is 24 square centimeters, the height and length of the base are 4 centimeters, its volume is () cubic centimeters, and the width of the base is () centimeters.

9.a and B are prime numbers. Their greatest common divisor is () and their least common multiple is ().

10, the surface area of a cube is 96 square decimeter, and its volume is () cubic decimeter.

1 1. A production team must process a batch of parts. Originally planned 15 days to complete the task, 50 pieces were actually done every day, and the task was completed three days ahead of schedule. Actually, I finish () every day.

12 and a number divided by 2, 3 and 5 respectively are all 1, so the minimum number is ().

13, two Xiaohua Mall can catch two fish in two hours. According to their fishing techniques, if you want to catch 10 fish within 10 hours, you should go to () Xiaohua Mall.

Second, multiple-choice questions (2 points for each question, ***20 points) (choose the correct serial number and fill in the brackets)

1. 1280 needs at least a few digits to be divisible by 3. ( )

( 1) 1 (2)2 (3)4

2. Make two cuboid frames with two equal iron wires, and then these two cuboids ()

(1) Equal surface area (2) Equal volume (3) Both surface area and volume are not necessarily equal.

3 has () divisors. 70.

( 1)5 (2) 8 (3)4

4. If x is divisible by 13, then x is ().

(1) 26 (2) 13 (3)1or13

5. The sum of prime numbers within10 is ()

( 1) 17 (2)25 (3) 19

6,36 equals 4 and 9 ()

(1) times (2) least common multiple (3) common multiple

7. If a means b = 7, then ()

(1) a must be divisible by B. (2)a must be divisible by B. (3)b must be a divisor of A.

8. A long rice cooker can hold water 3 ()

(1) l (2) ml (3) m3

9. Merge two cubes with side length of 1 decimeter into a cuboid, and the surface area of the merged cuboid () is the sum of the surface areas of the original two cubes.

(1) greater than (2) less than (3) equal to

10. Of the following four sentences, the correct one is ().

(1) Two cubes with the same surface area have the same volume.

(2) Two prime numbers have no common divisor.

(3) A number is a multiple of B number, and A number must be a composite number.

(4) Even numbers are composite numbers.

Iii. Simple calculation (12)

1、 15.39×4.62+53.8× 1.539 2、9.98×97+29.94 3、 1 1 1 1÷25

Four, the application problem (1 to 3 questions each 6 points, the rest each 5 points, ***43 points)

1. How many square decimeters of iron does it take to make a cuboid iron water tank with a cover whose length, width and height are 8 decimeters, 6 decimeters and 5 decimeters respectively? What is the volume of this box?

2. How many liters of water can a rectangular iron drum with a width of 2.5 decimeters and a height of 35 centimeters hold?

3. An auditorium is 20m long,15m wide and 8m high. It is necessary to paint the ceiling and surrounding walls of the auditorium, excluding the area of doors and windows 120 square meters, with an average paint of 0.45 kg per square meter. How many kilograms of pigment does a * * need?

4. A cube fish tank with a length of 12 cm is filled with water. Pour water into a cuboid fish tank with a length of 18 cm and a width of 10 cm. How deep is the water?

5. There are three iron wires, one is 24m long, the other is 32m long, and the other is16m long. Divide them into small pieces of the same length. How long is each piece?

6. Children divide apples. If everyone is divided into two, there is 16. If everyone is divided into five parts, it will be less 14. How many children are there?

7. Lingling is 1 1 years old, and grandpa is 74 years old. No matter how many teenagers there are, Grandpa is four times as old as Lingling.

8. Three cows and six sheep graze 93kg a day, and six cows and five sheep graze 130kg a day. How many Jin of grass does each cow eat more than each sheep every day?

Last/better/previous/last name

/stjj/stwnj/index.htmlThere are many natural numbers A and B, the greatest common divisor is 7, the quotient obtained by dividing A by B is L, and B is _ _ _ _.

Analysis: If (a, B) =7 and A: B =, then the number of b =7×8=56.

2. There are 1 15 candy, 148 cookies and 74 oranges in the kindergarten, which are distributed to the children in the big class on average. As a result, there are 7 sweets, 4 biscuits and 2 oranges. How many children are there in this big class at most?

Analysis: According to the meaning of the question, it is not difficult to see that the number of children in this large class is the greatest common divisor of 1 15-7 = 108, 148-4= 144, 74-2=72. So this big class has at most 36 children.

Grandpa said to Xiaoming, "I am seven times your age now, six times your age in a few years, five times, four times, three times and two times your age in a few years." Do you know the age of Grandpa and Xiaoming now?

Analysis: The ages of Grandpa and Xiaoming are changing with the passage of time, but their age difference remains the same. Grandpa's age is now seven times that of Xiaoming, indicating that their age difference is a multiple of 6; Similarly, their age difference is a multiple of 5, 4, 3, 2, 1 It can be inferred that their age difference is a common multiple of 6, 5, 4, 3 and 2. [6,5,4,3,2] = 60, and the age difference between Grandpa and Xiaoming is an integer multiple of 60. Considering the actual situation of age, the age difference between grandpa and Xiaoming should be 60 years old. So now Xiaoming's age is 60 ÷ (7- 1) = 10 (years old).

Grandpa's age = 10×7=70 (years).

4. Given that the greatest common divisor of two natural numbers is 4 and the least common multiple is 120, find these two numbers.

Analysis: These two numbers are 4 and 120, or 8 and 60, or 12 and 40, or 20 and 24.

The sum of two natural numbers is 50, and their greatest common divisor is 5. Try to find out the difference between these two numbers.

Analysis: Two numbers can be 7,49 or 2 1, 35; Then the difference is 42, 14.

1. Fill in the appropriate prime number in ().

( 1) 15=()+()

(2) 16=()+()=()+()

(3)24=()+()=()+()=()+()

Sit in the right position

1. 17 and 18 are ()

A. prime number B. prime number C. composite number

2. The common divisor of two prime numbers is ()

A.1b.2c. Infinite.

Three. solve problems

1. There are 60 students in grade six and 72 students in grade five. They were divided into groups to plant trees. The number of people in each group is required to be equal, with a maximum of several people in each group. How many groups are there in grades five and six?

The school playground is 96 meters long, and a red flag has not been inserted every 4 meters from one end to the other. Now, it's time to plant a red flag every 6 meters. How many little red flags don't have to be pulled?

Three children clubbed together to buy an Olympic brooch in 48 yuan. The first child paid one-seventh of the total amount paid by other children, while the second child paid one-third of the total amount paid by other children. How much did the third child pay?

Party A, Party B and Party C buy cakes 10, and share them equally. At the time of purchase, Party A paid for 6 cakes, Party B paid for 4 cakes, and Party C didn't. At the time of settlement, C will pay 6 yuan, and how much will A get back?

Math problem in the fifth grade of primary school: a line includes the starting station and the terminal station *** 14. If a bus happens to have a passenger at every station except the terminal, how many seats does the bus have at least?

Xiaoming and his parents are 88 years old this year, and his father is five years older than his mother. Six years ago, my father was seven times as old as Xiao Ming and my mother was six times as old as Xiao Ming? How old is Xiaoming this year?

49 tons of watermelon were transported to the city by trucks with a load of 5 tons and 3 tons. How many trucks were transported by truck? . . . .

1. Yes 1 Yuan, with several notes from 2 yuan and 5 yuan. How many ways can 8 yuan withdraw money?

2. On Sunday, 10 children went for a spring outing and passed by a shop, each of whom bought a bottle of soda. The store stipulates that three empty soda bottles can be exchanged for one soda bottle, so how many soda bottles can they drink at most?

1. How many square decimetres of glass does it take to make a rectangular bathtub (without a cover) with a length of 8 decimetres, a width of 4 centimetres and a height of 6 centimetres? If glass costs 4 yuan per square decimeter, how much does it cost to buy glass at least? 2. A room is 6 meters long, 3.5 meters wide and 3 meters high, with 8 square meters of doors and windows. Now, the walls and top of this room should be painted with cement. What is the area of cement painting? If you need 4 kilograms of cement per square meter, how many kilograms does a * * * need? The length of a cube stone is 5 decimeters and the weight is 2.7 kilograms per cubic meter. How much does this stone weigh? 4. A box of biscuits is 20cm long, 15cm wide and 30cm high. Now, you should put a trademark paper around it. What is the area of this trademark paper? A rectangular stone, its cross-sectional area is 36 square decimeters and its length is 0.8 meters. If the stone of 1 cubic decimeter weighs 2.7 kilograms, how many kilograms does this stone weigh? 6. A cuboid medicine can hold 60 liters of medicine. It is known that the medicine pot is 5 centimetres long and 3 centimetres wide. What is its depth? 7. There is a cubic iron block with a side length of 80 cm. Now it is necessary to melt it into a cuboid with a cross-sectional area of 20 cm. What is the length of this cuboid? 8. Put two cubes 5 cm long together to form a cuboid. What is the surface area of this cuboid? 9. A section of rectangular steel, with a length of1.6m and a cross section of 4cm square. It weighs only 7.8 grams per cubic centimeter. How much does this square steel weigh? 10. Make an uncovered cuboid oil drum with iron sheet. The length and width are 4 decimeters and the height is 6 decimeters. How many square decimetres did the iron sheet use? Put gasoline in a barrel, and each liter of oil weighs 0.82 kg. How many kilograms of gasoline can this barrel hold? 1 1. The bottom of a cuboid is a square with a side length of 10 decimeter and a height of 6 decimeters. What is the sum of the sides of this cuboid? What is the floor space? What is the surface area? What is the volume? 12. A cuboid glass tank, measured from the inside, is 40 cm long and 25 cm wide, and the water depth in the tank is 12 cm. After a stone is immersed in water, the water surface rises to 16 cm, and the volume of the stone is found. 13. The distance between Party A and Party B is120km. It took someone five hours to get from A to B by bike, and it took four hours to get back to speed up. How many kilometers per hour does he commute on average? 14. Make 12 cuboid iron chimneys, each section is 2m long, 4m wide and 3m high. How many square meters of iron do you need at least? 15. Put two cubes with a surface area of 24 square decimeters together to form a cuboid. What is the volume and surface area of this cuboid? 16. Cut the 4m-long steel bar into 6 sections on average. How long is each part? What percentage of the total length does the three sections account for? 17. It took Party A 12 hours, Party B 8 hours and Party C 9 hours to complete a project .. Three people worked together for one hour, how much is left in the whole project? 18. Two cars * * * transport goods 10.5 tons. Car A transports twice as much goods as car B, with 4 tons less. How many tons do the two cars transport? 19. A rectangular glass jar, measured from the inside, is 5 decimeters long and 3 decimeters wide. Existing water depth 1.5 decimeter. When a stone is immersed in water, the water depth is 2 decimeters. What is the volume of this stone? 20. A room is 8 meters long, 6 meters wide and 2.5 meters high. If the walls around the room are covered with wallpaper, how many square meters of wallpaper do you need * * excluding the area of doors and windows of 10 square meters? 3.5 yuan, how much is the wallpaper per square meter? 2 1. There is a swimming pool with a length of 25m, a width of12m, a depth of1.4m, and a bottom and periphery of 2m. How many square white tiles do you need? 22. A cubic container with a length of 6dm is filled with water, and all the water in the container is poured into a rectangular sink. From the inside, the water tank is 6dm in length, 5dm in width and 8.5dm in height. How deep is the water filled in the water tank at this time? How many liters of water should I pour in to refill the tank? 23. In Yu Ying, there are 120 students in the senior grade, 130 students in the middle grade and 140 students in the lower grade. What percentage of the whole school is in the middle grade? 24. A cuboid iron box with a square bottom will get a square with a side length of 40 cm if one side of it is unfolded. What is the volume of this iron box? 25. The teacher made 40 small red flowers and distributed them to the first group, the second group and the rest to the third group. What percentage of total safflower did the third group get?

1. Cut the 5m-long rope into four sections on average, each section is () meters long, and each section is the whole length. () 2. Give three kilograms of fruit to four children, and give () kilograms to each child. Master Wang made five parts in 8 minutes. He can make () parts per minute, and he has to make one part. There is () a 5-meter-long rope to cut it, and () 5.0 plus 9 molecules. The size of the denominator plus () fraction will not change. 6. The smallest three digits divisible by 2 and 3 at the same time is () The smallest three digits divisible by 3 and 5 at the same time is () The smallest three digits divisible by 2, 3 and 5 at the same time is () The largest two digits divisible by 2 and 3 at the same time is () 2. The largest divisible digit of 5 is () 100, the largest prime number is () 50, the sum of all prime numbers is () 20, the sum of all odd numbers is () 20, and the sum of all even numbers is () 8. Three digits, one digit is the smallest composite number. This three-digit number is () 9. A basket of apples, one for two, one for three, one for four, one for five, at least () 10. A number is a multiple of 6 and a factor of 48, which may be within () 1 1.20. The number of complex numbers is () 12. The sum of all the simplest true fractions with a denominator of 8 is () The sum of all the true fractions with a denominator of 8 is () 13. The sum of the sides of a cube is 60 cm. Its surface area is () and its volume is () 14. The largest four-digit number that can be divisible by 2, 3 and 5 at the same time is () 15. Cut a big color cube into eight small cubes, and three color cubes have () squares. Cut a large color cube into 27 small cubes. 1 has () blocks painted on its surface, and () blocks are painted on its surface. A = 2× 2× 3× 5× 7b = 2× 3× 7 A and B. () The greatest common factor of A and B is () 17. A small part. Fractional value () The numerator of a fraction is magnified 3 times, and the denominator is magnified 3 times. Fractional value () is 18. When the side length of a cube is doubled, its total side length is enlarged () times, its surface area is enlarged () times, its volume is enlarged () times, its total side length is enlarged () times, and its surface area is enlarged () times. Volume magnification () times 19. There are () true fractions with the simplest denominator of 9, and their sum is () true fractions with the denominator of 9, and their sum is () false fractions with the numerator of 9, with () factors of 20.36 and () 2 1. There are 44 students and 24 girls in the class. If boys and girls are divided into equal groups, they can be divided into () groups, and each group has at most () 22. Rice is () meters. It can also be () meters. 23. The volume of a Rubik's cube is about 30 () The volume of an automobile fuel tank is about 30 () The volume of an eraser is about 8 () The length of one step is about 6 () 24. 152 The decomposition prime factor is () 25. The natural number A is 1 1 multiple of B. The greatest common factor of A and B is () The smallest common multiple of A and B is () The greatest common factor of A and B is () A is a factor of B. The greatest common factor of A and B is () 26.9. A rectangular object is 4 centimetres long, 3 centimetres wide and 2 centimetres high. If you cut it into two small cuboids, its surface area will increase by at most () square decimeter and its volume will increase by () cubic decimeter. A batch of parts, 10 qualified, 1 unqualified. Unqualified accounts for () of the total. Unit conversion: 100 minutes = () hours and 45 minutes = () hours and 225 square centimeters = () square meters (fill in fractions) 18 hours = () days (fill in fractions) 45ml=( )L (fill in fractions) 68 minutes = () hours. 1.032m3 = () cubic decimeter = () cubic centimeter1.032m3 = () cubic meter () cubic decimeter 2.05l = () cubic decimeter = () milliliter 2.05l = () cubic decimeter () The simplest fraction of the milliliter judgment question is the fraction whose numerator and denominator are prime numbers ... The sum of all true fractions with denominator of 8 is 2 ........................... () The sum of all the simplest true fractions with denominator of 8 is 2 ............ () The product of two different natural numbers must be a composite number ................... () Two different ones. Fractions whose denominators are all prime numbers are called simplest fraction molecules. What percentage of .................................................................................................................................................................. brine is water? What is the salt content in the water? How many times more water than salt? Make a square block from a rectangular block with a length of 24cm and a width of 16cm. What is the minimum length of the side of this big square? At least this small rectangular block of wood. How many pieces? Use square floor tiles to lay a room with a length of 24m and a width of 27m. The floor tiles to be used are all one block. What is the maximum length of floor tiles that can be used? How many tiles do you want to use? 4. A cubic pen container, with a total length of 36 cm and a surface area of () square cm. 5. How many square decimetres of iron sheet does it take to make an uncovered cuboid iron box with a length of 40cm, a width of 30cm and a height of 20cm? If the weight of gasoline per liter is 0.82 kg, how many kilograms of gasoline can this iron box hold? 6. Master Wang makes five parts in four hours, Li Shifu 1 1 parts in nine hours, Master Wang makes () parts per hour, while it takes () hours to make a part in Li Shifu. 7.A is greater than B. What is the sum of A and B? 8.A is, B is greater than A, what is the sum of A and B? 9. The bridge pile is driven into the river bottom for 2m, the water depth is12m, and the water surface is 2m. How long is the bridge pile?