() is 45; 60 is (); 15 is 25 ()

The reciprocal of 16 is (); The reciprocal of half is ().

Hours = () hours () minutes; (16)

2.)= ÷( )= +( )= 1 -( )=( )×9=

( )×0.25= 1。 (12)

3.A: B =, then when A= 18, B = (); When B= 18, A=( )(4 points)

4. If number A is number B, then number A is greater than number B ()%, and number B is less than number A ()%. (4 points)

5. In 3: 2, if the former item is added with 6, the proportion should remain unchanged, and the latter item should be added with (). (2 points)

6. A triangular vegetable field with a side length ratio of 3: 4: 5 and a circumference of 84 meters, of which the shortest side length is () meters. (3 points)

7, sampling inspection of a commodity, there are 38 kinds of qualified, 2 kinds of unqualified, the qualified rate of this commodity is () ℅ (2 points).

8. The simplest integer ratio: 1.75 is () and the ratio is () (4 points).

9. The radius of the bottom of the cylinder is 3 cm and the height is 5 cm. Its bottom area is () cm2, lateral area is () cm2, and its surface area is () cm2. Its volume is () cubic centimeters. (12)

10, the bottom diameter of the cone is 20 decimeters, the height is 9 decimeters, and the volume is () cubic decimeters. (2 points)

1 1. Cut the largest circle on a square cardboard with a side length of 10cm. The area of this circle is () cm2, and the remaining scraps are () cm2. (4 points)

12. The circumference of the rectangle is 42 cm, the length-width ratio is 4∶3, and the area is () square cm. (2 points)

13. Weld a cubic frame (excluding joints) with 72cm long iron wire. This cubic frame has a side length of () cm, a volume of () cm3 and a surface area of () cm2. (9 points)

14. The volume of the cone is 9.42 cubic decimeters, the diameter of the bottom surface is 6 decimeters, the height is () decimeters, and the volume of the cylinder with the same height as the bottom surface is () cubic decimeters.

(6 points)

15. Dissolve 12g of salt in 88g of water, at which time salt accounts for () %(2 points) of saline water.

16. Observe the right picture. The school is in Xiaoming

Home is () degrees away from here.

Up, the distance is about () meters.

(8 points)

17, the object observed from the () surface is; What you see from the surface of () is; What you see from the surface of () is. (6 points)

18. The height of cylinder and cone is the same. The volume of cylinder is more than that of cone 10.8 cubic meter, and the volume of cylinder is () cubic meter. (2 points)

Report 1. After woodworkers finish the doorframe, in order to prevent deformation, they often nail two diagonal battens, as shown in the figure. The mathematical reason for this is _ _.

2. In the subtraction formula, the sum of the minuend, subtraction and difference is 240, and subtraction is 3/5 of the difference. Then the difference of this subtraction formula should be ().

3. 3/4 of A is equal to 2/3 of B, and the simplest ratio of A to B is (): ().

4. A three-digit number, its single digit is A, its ten digits are B, and its hundred digits are C, so it should be recorded as ().

5. Divide the 8-meter-long iron wire into 5 pieces, each piece is 1 () and 3 meters (), each piece is () meters long.

6. Li Shifu assembled a TV set, and the work efficiency increased by 1%, so the time was reduced ().

7. There are two natural numbers, the greatest common divisor is 8 and the smallest common multiple is 240. These two natural numbers may be (), () or ().

8. For a basket of apples, each person is divided into two surpluses 1, three surpluses 1 and four surpluses 1. There are at least () apples in this basket.

9. For the simplest fraction, the sum of numerator and denominator is 92. If 16 is subtracted from both the numerator and denominator, the simplified score is 1/3, which is the simplest fraction ().

10, carefully observe the following figures and fill in the appropriate figures.

( 1)2,3,5,8, 13,( ),( ),34,

(2)2,6, 12,20,( ),42,

11.19970701pronounced as (). Rounding to ten thousand places is () ten thousand.

12.8 tons 50 kg = () tons; 2.4 cubic decimeter = () cubic decimeter () cubic centimeter

The decimal unit of 13.7/ 12 is (), and it has () such decimal units.

14. The smallest composite number is (), and its reciprocal is ().

The least common multiple of 15. 12, 18 and 24 is (). The greatest common divisor of 12 and 18 is ().

16. The ratio of peach trees to pear trees in the orchard is 5: 3. There are 40 peach and pear trees, () peach and () pear trees.

17. () The statistical chart can not only show the quantity, but also clearly show the change of the quantity.

18.6 may be the least common multiple of two numbers, please write them all separately; ( )。

19. A rope was cut and then connected for 9 meters, and the result was longer than the original. This rope was originally () meters long.

20. A rectangular piece of paper, the length of the long side is 19 cm, cut off the largest square, and the circumference of the remaining small rectangular paper is ().

2 1. 10098400 is pronounced as (), rounded to tens of thousands of digits is ().

22. When a number is divided by 2, 3 and 7, the result is 1, and the minimum number is ().

23. The product of two prime numbers is even, and one of them must be ().

24.20kg is 20% lighter than (). () meters are longer than 5 meters.

25. Four times the number of A is the number of B, and the ratio of A to B is ().

26. Cut a section of wire, that is, a wire () meters long, and then connect it for 4 meters. The result is longer than the original wire.

27. The average of A and B is 16, and the average of A, B and C is 20, so the number of C can be calculated as ().

28. The price of a commodity is reduced by 10% during the promotion period, and the price is increased by 10% after the promotion. At this time, the price of goods is the original price ().

29. A work started in June 1 was originally scheduled to be completed in one month. In actual construction, the task was completed on June 25th, and ()% was overfulfilled by June 30th.

The surface area of a cuboid is 4000 square centimeters. If the cuboid is cut into two equal cubes on average, if two such cubes are put together to form a cuboid, the surface area of the cuboid is at most ().

3 1, a number is 2 1, b number is 30, and a number is less than b number ()%.

There are 29 students in grade five, more than girls 16%, and girls have ().

33,365.5505 Writing ().

34. A triangular vegetable field has a side length ratio of 3: 4: 5 and a circumference of 84 meters, of which the shortest side length is () meters.

35, the ratio of the circumference of the circle to the diameter is ()

36, 3.6 hours = () when () points.

37. It takes 4 days for Party A to complete the same work alone, and 5 days for Party B. The efficiency of Party A is ()% of that of Party B.

38, sampling inspection of a commodity, there are 38 kinds of qualified, 2 kinds of unqualified, the qualified rate of this commodity is ().

39, 7/8: 1.75 The simplest integer ratio is (), which is ().

40. The hour hand of the wall clock is 5 cm long, and its tip has gone () cm all night.

4 1. The base of the triangle is 4cm long and 2cm high. The ratio of the area of this triangle to the area of a parallelogram with the same base height is ().

42. Two-thirds of A is equal to three-quarters of B, and the simplest integer ratio of A and B is ().

There are (339) natural numbers less than 400 without the number 8.

2. Nine copper coins, one of which is fake, and the authenticity is only different in quality. If you weigh it at least (8 times) with a balance without weight, you can definitely find out the fake copper coins.

3. There is a warehouse ***5 warehouses every100km on the highway. Warehouse 1 has 10 tons, warehouse 2 has 20 tons, warehouse 5 has 40 tons, and the other two warehouses are empty. Now I want to put all the goods in one warehouse. If the freight of 1 km per ton of goods needs 1 yuan, then it needs at least (10000) yuan.

1No. 100 km 2 100 km 3 100 km 4 100 km 5.

10 tons, 20 tons and 40 tons

There are 207 students in Grade 6 * *, of whom 2/ 1 1 boys and 7 girls were selected to take part in the math contest. The number of other boys and girls is the same, with 97 girls in grade 6.

5. Xiaolan and Xiaoli play guessing games. Xiaolan writes a four-digit decimal on the straight line for Xiaoli to guess. Xiaoli asked, "Is it 603 1?" Xiaolan said: "I guessed a number, and the location is correct." Xiaoli asked again, "Is it 5672?" Xiaolan said: "I guessed both numbers correctly, and neither position is right." Xiaoli asked again, "Is it 4796?" Xiaolan said, "I guessed four numbers right, but none of them are right." Can you infer the four digits written by Xiaolan from the above information? 6974

6. If 20 rabbits can be exchanged for 2 sheep, 8 sheep for 2 pigs and 8 pigs for 2 cows, how many rabbits can 4 cows be exchanged? 640

7. Light light blue is 8 years old and her father is 38 years old. How old is light light blue? Dad is exactly four times as old as light light blue. 10

8. For the people, every three empty soda bottles can be replaced by 1 bottle. Light light blue bought 99 bottles of soda in the summer vacation, and changed them into empty bottles after drinking them. How many bottles of soda can she drink at most? 147

9. In a division formula, the sum of dividend, divisor, quotient and remainder is 75, the known quotient is 8, and the remainder is 2. What are the dividend and divisor?

58 7

10. There are two iron wires of the same length. The first one is minus 30 cm, the second one is minus 18 cm, and the remaining length of the second one is twice that of the first one. How many centimeters is left in the second wire? 24

There are 1 1, 1, 2, 3, 4, 5, 6, 7, 8 and 9 cards, each with three cards. A said, "The product of my three cards is 48", and B said, "The sum of my three cards is 65438.

238 564 179

/kloc-how many different rectangles can a 0/2.24cm long iron wire enclose (the length and width are all whole centimeters, not counting joints)? What are the areas? Compare it again. What can you find? six

13 Master Zhang is used to taking two days off every five days of work. Recently received the task of producing 330 parts. He produces 30 parts every day. How many days will it take to complete this task? 15

On Sunday, Xiaohui took a taxi to visit her grandmother 8 kilometers away. When taking the bus, he looked at the fare list on the taxi: 8 yuan within 5 kilometers; More than 5 kilometers per kilometer in 2 yuan. How much does Xiaohui have to pay to go to grandma's house?

14

15, a decimal, if you expand its decimal part by 4 times, you will get 5.4; If you enlarge its decimal part by 9 times, you get 8.4. What is this decimal? 3、6

16, average height of Party A and Party B 1.66m, average height of Party B and Party C 1.7m, average height of Party A and Party C 1.65m, what is the average height of Party A, Party B and Party C?

1。 67

17, the sum of a, b and c is 270. A is three times that of B, and B is twice that of C. What are the numbers of A, B and C respectively?

180 60 30

18. There are two coal yards A and B. The coal storage capacity of coal yard A is three times that of coal yard B. If 180 tons is transported from coal yard A to coal yard B, the coal storage capacity of the two coal yards is equal. How many tons are there in coal yard A and coal yard B respectively?

540 180

19, five players line up to do exercises, among which 1 new players can't stand at the head. How many different ways are there?

96

There are 50 students in Class 20.6 (1). There are 25 swimmers, 28 gymnasts and 5 non-gymnasts. How many students can swim and do gymnastics? eight

2 1. It takes 6 hours for the ship "Youth" to sail along the river at 120km, and 20 hours to sail against the current at 280km. How many hours does it take for this ship to sail 340 kilometers in still water?

20

22. Arrange all the simplest false scores with denominator of 15 from small to large, and find the numerator of the 99th false score.

2 14

23. Make a bouquet with 96 red flowers and 72 white flowers. If there are the same number of red flowers and the same number of white flowers in each bouquet, how many flowers are there in each bouquet?

84

2. There are 240 students taking part in large-scale group gymnastics. They stand in a row facing the coach and press 1, 2, 3, 4, ... from left to right. The coach asked each student to remember the number he quoted and do the following actions: first, let the students who quoted a multiple of the number 3 back off, then let the students who quoted a multiple of 5 back off, and finally let the students quote a multiple of 7. 34+80+48- 16-6- 1 1= 162-33= 129

1. The mountain village postman went over the mountains from the post office and took 6.5 hours to deliver the mail to the user's home. His speed up the mountain is 3 kilometers per hour, and his speed down the mountain is 5 kilometers per hour. How long does it take to return at the same speed?

4.7

1.8 8 3 3 Calculate 24 with+-*/().

2.3 3 7 7 Use+-*/() to calculate 24.

3. Bus length190m, truck length 240m. The two cars are traveling at a speed of 20 meters per second and 23 meters per second respectively. How many seconds does it take to meet from front to back on the double-track railway?

An: 10 second.

4. Calculate1234+2341+3412+4123 =?

5. The first item in arithmetic progression is 5.6, and the sixth item is 20.6. Find its fourth project.

6. The sum is 0.1+0.3+0.5+0.7+...+0.87+0.89 =?

7. Coins with 1.2.5 cents * * 100, with a total value of 2 yuan. It is known that the total value of 2-cent coins is more than 1 cent coins 13 cents. How many coins are there in each of the three types?

8. The distance between A and B is 465 kilometers. It takes * * * 7 hours for a car to travel from A to B at a speed of 60km/h, and then speed up 15km/h to arrive at B. How many hours have you been driving at a speed of 60 km/h?

9 .. There are several chickens and rabbits in the cage, which are *** 100 feet. If the chicken is replaced by a rabbit and the rabbit is replaced by a chicken, it will have 92 feet. How many rabbits and chickens are there in the cage?

10. Spiders have eight legs, dragonflies have six legs and two pairs of wings. Cicada has six legs, 1 pair of wings. At present, there are 18 of these three kinds of bugs, with 1 18 legs and 20 pairs of wings. How many bugs are there in each species?

1 1. In the activity of learning from Lei Feng, students * * * did 240 good deeds, senior students each did 8 good deeds, and junior students each did 3 good deeds, with an average of 6 good deeds. How many students are there in this activity?

12. A class of 42 students participated in tree planting, with an average of 3 trees planted by boys and 2 trees planted by girls. It is understood that boys plant 56 more trees than girls. How many boys and girls are there?

13. There are 6 different Chinese books, 4 different foreign language books and 3 different math books on the bookshelf. How many different ways can you get them?

14. Students in one class plant trees, and there are 100 Chinese fir seedlings and poplar seedlings. Each group was divided into 6 Chinese fir seedlings and 8 poplar seedlings. In this way, the Chinese fir seedlings have just been beaten, and there are two poplar seedlings left. How many Chinese fir seedlings and poplar seedlings are there?

15. With 8 kilograms of silk, it can be woven into a width of 6 decimeters and a length of 4 meters. Now we have 10 kg of silk. To knit 7.5 decimetres wide, how many metres can you knit?

16. Here is a number of 1 1, and the sum of every three adjacent numbers is 15. Do you know what the question mark means? What's the number of this 1 1?

17 ... Party A, Party B and Party C bought eight loaves and divided them equally. Party A paid five cakes, Party B paid three cakes, and Party C didn't bring any money. After calculation, C should pay 4 yuan, and how much should A take back?

18. Football has five teams: A, B, C, D and E, and each team has to play a game with other teams. How many games are there altogether?

19. 12 total coin value 1 yuan, of which only five cents and 1 minute. How many coins are there?

20. Party A and Party B go to the store to buy clothes. Party A 100 Yuan, Party B 70 yuan. After they bought clothes at the same price, they found that the money left by Party A was exactly four times that of Party B. How much did Party A and Party B spend on clothes?

2 1.57 military vehicles lined up to cross a bridge with a distance of 2m. The bridge is 200 meters long, and each military vehicle is 5 meters long. How many meters is it from the front of the first car to the rear of the last car?

22. Buying 18 table with 6 chairs costs 1560 yuan, and the price of 10 table is more than the price of 6 chairs. 680 yuan, how much is each table? How much is each chair?

23 ..A Two oil storage tanks, A and B, have less oil storage than B. Enter 1/6 1/4 B into A. A has 2 tons more oil storage than B. How many tons does B have?

24. The factory organized 400-450 people to participate in tree planting activities, and each person planted 32 trees on average. Male workers and female workers planted an average of 48 trees and 65,438+03 trees respectively. How many male and female workers took part in planting trees? (Number of people in proportion)

25. Stores A, B and C have 120 pieces of relief materials, which is the sum of warehouses A and C, and C is half of warehouses A and B. How many pieces of relief materials are there?

26 .. A, B and C installed 500 TV sets in three groups. The ratio of the number of TV sets installed in the two groups is 5:3, and C is 39 fewer than B. How many TV sets has C installed? (Suppose there are 39 units left in C)

27. The distance between A and B is 243 kilometers. A van and a bus leave from A and B at the same time, face to face, 1.5 hours later. The speed ratio of truck and bus is 4:5, so how many hours will it take for the bus to complete this journey? (two methods)

28. A daily chemical factory produced 9800 pieces of laundry soap, 5/9 more than the soap produced. How many boxes of laundry soap and soap are produced? (Solving problems skillfully with variable rate)

29. Xiao Ming and Xiao Cong started running back and forth at both ends of the 60-meter runway respectively. Xiao Ming runs 2 meters per second and Xiao Cong runs 3 meters per second. They ran for five minutes. How many times have they met during this period?

Xiao Qiang bought three pencils, three ballpoint pens, eight notebooks and twelve erasers. The salesman said * * * should pay 13 yuan, 1 minute. People know that 2 yuan has a 4-cent pencil and an 8-cent ballpoint pen in his money. He asked the shop assistant if his account was wrong.

3 1. For a project, Party A will work alone for 3 days, and Party B will sit alone for 5 days. Now Party A will do 1 day first, and how many days will the remaining cooperation between Party A and Party B be completed?

32. The rice in warehouse B is 4/5 of that in warehouse A. If 4 tons of rice is transferred from warehouse A to warehouse B, the weight ratio of rice in warehouse A and warehouse B is 3: 4. How many tons of rice were originally stored in warehouse B and warehouse B?

At 33.7: 00, the minute hand lags behind the hour hand by 100 degrees.

34. Two cars start from A and B at the same time, face to face, each lane of A is 50 kilometers, and each lane of B is 60 kilometers, and they meet after 3.5 hours. How many kilometers is it between A and B? (Answer in two ways)

35. Xiaoming and Xiaoqing's homes are 4.5 kilometers apart. They both ride bicycles from home at the same time. Xiaoming travels 50 meters per minute and Xiaoqing travels 40 meters per minute. How many minutes did they meet?

36. Xiaoming and Xiaoqing's homes are 4.5 kilometers apart. They both ride bicycles from home at the same time. Xiaoming travels 50 meters per minute and Xiaoqing travels 40 meters per minute. How many minutes did they meet?

37. Buses and trucks start from two cities at the same time and go in opposite directions. Buses travel 45 kilometers per hour, 3 kilometers more than trucks. Four hours later, the two cars met. How many kilometers are the two cities apart?