(with reference answers)

1, uncle worker made 24 parts in 3 hours. According to this calculation, how many parts did he make in 8 hours?

Last semester

2. Uncle Wang took 1500 yuan to buy fertilizer, bought 9 bags of fertilizer, and brought it back 15 yuan. How much is each bag of fertilizer?

Uncle Zhang bought 15 piglets for 7455 yuan. He wants to buy another 30 such piglets. How much is he going to prepare?

4, a pair of leather shoes 105 yuan, the price of a dress is twice that of shoes. How much does it cost mom to buy a pair of shoes and a dress?

5. Yucai Primary School should divide 180 Young Pioneers into 6 teams on average, and each team will be divided into 5 groups. How many young pioneers are there in each group on average?

6. Xiaorong raised 45 chickens and 18 ducks. If each chicken can lay 13kg a year and each duck can lay 12kg a year, how many Jin of eggs can these chickens and ducks lay a year?

7. A pencil is 7 points more expensive than an eraser. A ballpoint pen can buy 1 1 pencils. It is known that an eraser is 8 points. How much is a ballpoint pen?

8. Zhang Jun is 45 years old and Xiaogang is 5 years old. How many times will Zhang Jun be bigger than Xiaogang in three years?

9. Xiaoming has money from 40 yuan, more than 6 yuan from Xiao Qiang. How much money do they have? How much did Xiao Ming give Xiao Qiang? They both have the same amount of money.

10. There are 42 male workers in a factory, and the number of female workers is three times less than that of male workers. 1 1. How many workers are there in this factory?

1 1. Uncle Wang opened fertilizer in the fertilizer plant. It took five hours to go at 48 kilometers per hour, and only three hours to come back empty. What was the average speed when I came back? What is the average speed of going back and forth?

12. The school will distribute exercise books to 8 classes, each class has 200 copies, and 100 copies will be reserved for awarding prizes. How many exercise books should schools buy?

13, the school canteen carries coal 1 ton, and it is planned to burn for 40 days. Thanks to the improved stove,

Save 5 kilograms every day. How many days can this batch of coal burn?

14. A binding team has to bind 2640 books, and 240 books have been bound in 3 hours. According to this calculation, how many hours will the remaining books be bound?

In grades 15 and 4, 244 books will be restored for the library. Repair 49 copies on the first day, 5 1 copy on the second day, and finish the rest three days. How many books will you repair on average every day?

16, the site needs 50 tons of yellow sand. It was transported five times by a car with a load of 4 tons, and the rest was transported by a car with a load of 5 tons. How many times will it be shipped?

17. Flowers 120 Buy a pot of flowers, 4 pots for free, and 25 pots for school. What is the lowest cost?

18. An elephant needs to eat 350 kilograms of food a day. The breeder prepared 6 tons of food, enough for the elephant to eat for 20 days?

19, buy a bunch of flowers, 20 yuan, buy four 1. Aunt Li buys 4 bundles at a time. How much cheaper is each bundle?

20. In fruit shops, 2 kilograms of apples are sold in 5 yuan, and 3 kilograms of bananas are sold at 12 yuan. Mother is going to buy 6 kilograms of apples and bananas each. How much should she pay?

2 1. The PE teacher bought 8 boxes of badminton, each box was 12, and the price was ***288 yuan. How much is badminton on average?

22. Li Shifu has produced a batch of spare parts. Originally, it was planned to produce an average of 50 pieces per hour, which was completed in six hours. The task was actually completed in five hours. How many pieces are actually produced per hour?

The shop sent five boxes of fruit, weighing 50 kilograms. If these fruits are packed in small boxes, the weight of each box is half of the original. How many boxes can these fruits hold?

24.84 kg of soybean can squeeze out 12 kg of oil. According to this calculation, how many kilograms of soybeans do you need to squeeze 120 kilograms of oil?

25. There are 36 students in the school sports group, and the number of students in the art group is twice as small as that in the sports group, 12. How many people are there in the school art troupe?

26. In the fourth grade, I wanted to buy five photo albums and five mechanical pencil to reward three outstanding students. I spent 28.75 yuan on the album and 6. 15 yuan on mechanical pencil. How much is an album more expensive than mechanical pencil?

27. Dongguan Primary School sports team has 7 1 person, including basketball players 15. The number of track and field athletes is 2.4 times that of basketball players, and the rest are football players. How many people are there in the football team?

28. The store shipped 16 baskets of apples, each weighing 42.5 kilograms. Pears delivered are less than apples 120kg. How many kilograms of pears?

.

29, students do exercises, every 25 people in a row, 30 rows of boys and 28 rows of girls. How many more boys than girls?

30. Xiao Ming read a story book with 180 pages, and read it for 3 days, with an average of 24 pages a day. The rest read an average of 36 pages a day. How many days will it take to complete?

3 1. Xiaogang has 28 stamps. After giving Xiaohong eight stamps, they have the same number of stamps. How many stamps does Xiaohong have?

32. 15 teacher takes 129 students for an autumn outing. If there are 36 people in each car, how many cars does a car need?

33. A barrel of oil weighs 9 kilograms. Half of the oil was used, and there were 5 kilograms left in the bucket. How much does this barrel of oil weigh? How much does this bucket weigh?

34. In the park, there are 52 pots of flowers on both sides of a road from beginning to end. There are as many flowers on each side, and the distance between two adjacent pots of flowers is 4 meters. How long is this road?

35. The water consumption of Yuanyuan's family in the last four quarters is as follows.

one quarter

one

two

three

four

Water consumption (cubic meters)

123

178

196

163

How many cubic meters of water did Yuanyuan use on average every month last year?

36. In the fourth grade, 244 books will be restored for the library. Repair 49 copies on the first day, 5 1 copy on the second day, and finish the rest three days. How many books will you repair on average every day?

37. The construction site needs 50 tons of yellow sand. It was transported five times by a car with a load of 4 tons, and the rest was transported by a car with a load of 2.5 tons. How many times will it be shipped?

38. Pine trees and Berlin can secrete fungicides and purify the air. If 1 ha pine forest secretes 54 kilograms of bactericide every day, how many kilograms of bactericide does 24 hectares pine forest secrete 3 1 day?

39. 34 students from Class 3, Grade 4 took a group photo as a souvenir. Pricing 33 yuan, giving away 4 photos. In addition, each piece is printed in 2.3 yuan. Everyone in the class wants one. How much is one? How much is a normal photo?

40. A forest farm used a sprayer to spray medicine on trees, and two sprayers sprayed 200 trees in four hours. According to this calculation, how many plants can five sprayers spray in six hours?

4 1. Laying hens in mechanized chicken farms lay an average of 288 eggs every year. If calculated according to the weight of each 16 eggs 1 kg, how many kilograms of eggs are laid by each chicken every year?

42. To plant trees around the square pond, six poplars should be planted on each side. How many poplars should be planted on each side at least?

43. A travel agency offers two schemes, A and B, for a one-day trip to the West Lake. Each tour group can only purchase tickets according to one scheme.

Type A: each group with more than 5 people 150 yuan.

Type B: adult 200 yuan, child 100 yuan.

(1) 10 Parents take five children for a one-day trip to the West Lake. Which ticket is cheaper? How much will it cost at least?

(2) What if five parents have 10 children?

44. The sixth grade students of Yuhua Primary School went to the Ocean Museum in four batches. Three cars were rented in each batch. Each car has 35 people. How many people went to the Ocean Museum in the sixth grade?

45. The distance between Party A and Party B is 8800 kilometers. One car travels from Party A to Party B at a speed of 78 kilometers per hour, and the other car travels from Party B to Party A at a speed of 65 kilometers per hour. How many kilometers are the two cars separated from each other after four hours?

46. Two trains, A and B, run opposite each other. Car A travels 78 kilometers per hour. The b train runs at 62 kilometers per hour. 1 After the first car leaves, the second car leaves. After three hours, the two cars meet. How many kilometers is the railway between these two places?

47. Two cars are leaving from one place at the same time in opposite directions. Car A travels at an average speed of 65 kilometers per hour, while car B travels at an average speed of 62 kilometers per hour. After 3 hours, how many kilometers are the two cars apart?

48. A car and a motorcycle set off from two places 378 kilometers apart at the same time and left relatively. This car travels 72 kilometers per hour, which is twice the speed of a motorcycle. How long does it take for two cars to meet?

※ It takes six hours for a car to travel 580 kilometers from A to B.. On the way, some expressways are expressways, and the other part is ordinary highways. It is known that the speed of automobiles on expressways is120km, and that on ordinary highways is 80km. How many kilometers has the car traveled on the expressway?

50. Xiaohua's home is 2300 meters away from school, and he goes to walking to school every day. One day, he walked at a speed of 80 meters per minute. When he looked up, he found that he would be late. He immediately ran at a speed of 150 meters per minute, and it took him 20 minutes to get to school on time. How far does Xiaohua start running from school? ※?

Mathematics application problems in the fourth grade of primary school last semester

Reference answer

1, number of parts produced per hour × time = total number of parts

Solution: (24÷3)×8

=8×8

=64 (pieces)

He made 64 parts in eight hours.

2. Total price/quantity = unit price

Answer: (1500- 15)÷9

= 1485÷9

= 165 (yuan)

A: Fertilizer per bag 165 yuan.

3. Unit price × quantity = total price

Solution: (7455÷ 15)×30

=497×30

= 149 10 (yuan)

A: He has to prepare 149 10 yuan.

4. Payment for leather shoes+clothing = * * *

Solution: 105+( 105×2)

= 105+2 10

=3 15 (yuan)

A: Mom needs 3 15 yuan to buy a pair of shoes and a dress.

5. Total number of players, number of groups = number of people in each group.

Solution: 180(6×5)

= 180÷30

=6 (Name)

A: There are 6 young pioneers in each group on average.

6, eggs+duck eggs = annual egg production

Solution: 45× 13=585(㎏)

18× 12=2 16(㎏)

585+2 16=80 1(㎏)

Answer: These chickens and ducks can produce 80 1 kg eggs a year.

7. 1 1 price of pencil = 1 price of ballpoint pen.

Solution: (8+7)× 1 1

= 15× 1 1

= 165 (points) 165 points = 1 RMB 6.5 points.

A: A ballpoint pen 1 RMB 65.5.

Zhang Jun's age after 8.3 years ÷ Xiaogang's age after 3 years = Zhang Jun's age after 3 years is a multiple of Xiaogang's age after 3 years.

Solution (45+3)÷(5+3)

=48÷8

=6 (times)

In three years, Zhang Jun will be six times as old as Xiaogang.

9. Xiaoming's money+Xiao Qiang's money = total.

Xiaoming's money-the average of two people = the money Xiaoming wants to give to Xiao Qiang.

Solution: 40+(40-6) 40-( 40+34)÷2

=40+34 =40-37

=74 yuan =3 yuan

They have 74 yuan. Xiao Ming gave Xiao Qiang as much money as Sanyuan.

10, number of male employees+number of female employees = total.

Solution: 42+(42×3- 1 1)

=42+ 1 15

= 157 (name)

There are 157 workers in this factory.

1 1, distance/time = speed.

Solution: (48×5)÷3 240×2÷(3+5)

= 240 ÷3 = 480÷8

=80 km =60 km

Answer: When returning, the average journey is 80 kilometers per hour. The average speed back and forth is 60 kilometers.

12, send 8 classes+surplus = should be bought. ※

Solution: 8×200+ 100

= 1600+ 100

= 1700 (Ben)

A: Schools should buy 1700 exercise books.

13, the total amount burned every day ÷ the number of days burned = the number of days burned.

Solution: 1 ton = 1000 kg.

1000÷40=25 (kg)

1000÷(25-5)

= 1000÷20

=50 days

This batch of coal can burn for 50 days.

14, the remaining books are loaded every hour = binding time.

Solution: (2640-240)÷(240÷3)

=2400÷80

=30 (hours)

A: It will take another 30 hours for the remaining books to be bound.

15, remaining books ÷3 days = loaded every day.

Solution: 244-(49+51)144 ÷ 3 = 48 (Ben)

=244- 100

= 144 (Ben)

A: On average, 48 books are written every day.

16, solution: 40-(4×5)=20 (ton)

20÷5=4 (times)

A: It will be delivered in four installments.

17, the money for buying 5 pots of flowers and 4 pots, in fact, each pot of flowers is [120×4÷(4+ 1)] yuan. Unit price × quantity = total price. ※. (25 pots is a multiple of 5 pots)

Solution: [120×4÷(4+ 1)]×25.

=96×25

=2400 (yuan)

It will cost at least 2400 yuan.

18, solution: 350×20=7000 (kg)

7000 kg =7 tons

7 tons > 6 tons

A: Not enough.

19, solution: 20-[20×4(4+ 1)]

=20- 16

=4 (yuan)

A: Cheap 4 yuan money per bundle.

20. Solution: 5÷2×6+ 12÷3×6

= 15+24

=39 (yuan)

A: The money should be paid to 39 yuan.

2 1、288÷(8× 12)

=288÷96

=3 (yuan)

A: The average badminton is 3 yuan.

22. Solution: 6×50÷5

=300÷5

=60 (pieces)

A: Actually, the average production is 60 units per hour.

23. Solution: 50÷ 5÷ 2

=50÷5

= 10 (box)

A: These fruits can be packed in 10 boxes.

24. Soybeans needed per kilogram of oil × total oil = soybeans needed.

Solution: (84÷ 12)× 120

=7× 120

=840 kg

Answer: To extract 120 kg of oil, you need 840 kg of soybeans.

25. Solution: 36×2- 12

=72- 12

=60 (person)

A: There are 60 people in the school art troupe.

26. Solution: 28.75÷5-6. 15÷5

=5.75- 1.23

=4.52 (yuan)

A: An album is 4.52 yuan more expensive than mechanical pencil.

27. Solution: 71-15-15× 2.4.

=7 1- 15-36

=20 people

There are 20 people on the football team.

28. Solution: (16×42.5)×2- 120.

=670×2- 120

= 1340- 120

= 1 120 (kg)

Answer: The pear delivered is1120kg.

29. Solution: (30-28)×25

=2×25

=50 (person)

There are 50 more boys than girls.

30. Solution: (180-3×24)÷36

= 108÷36

=3 days

A: It takes three days to read it.

3 1, solution: 28-8-8

=20-8

= 12 (Zhang)

A: Xiaohong originally had 12 stamps.

32. Solution: (15+ 129)÷36

= 144÷36

=4 (vehicle)

A: A * * * needs four cars.

33. Solution: (9-5) × 2 9-8 =1(㎏)

=4×2

=8 kg

Answer: This barrel of oil weighs 8 kilograms. Barrel weight 1kg.

34. Solution: 52÷2=26 (basin) (52÷2- 1)×4.

(26- 1)×4 =25×4

=25×4 = 100 (m)

= 100 (m)

This road is 100 meter long.

35. The water consumption of Yuanyuan's family in the last four quarters is as follows. How many cubic meters of water did Yuanyuan use on average every month last year?

Solution: (123+178+196+163) ÷12

=660÷ 12

=55 cubic meters

A: Last year, households in Yuan Yuan used an average of 55 cubic meters of water per month.

36. Solution: (244-49+5 1)÷3

= 144÷3

=48 (Ben)

A: On average, 48 books are repaired every day.

37. Solution: (50-4×5)÷2.5

=30÷2.5

= 12 (times)

A: There will be another shipment of 12.

38. Solution: 54×3 1×24.

= 1674×24

=40 176 (kg)

Answer: 24 hectares of pine forest 3 1 day secretes 40 176 kg of bactericide.

39. Solution: (34-4) × 2.3+33

=30×2.3+33

=69+33

= 102 (yuan)

A: A * * * cost 102 yuan.

102÷34=3 (yuan)

A: On average, each photo costs 3 yuan money.

40. Solution: (200÷4÷2)×5×6

=25×5×6

= 125×6

=750 (tree)

A: Five sprayers can spray 750 plants in 6 hours.

4 1, solution: 288÷ 16= 18 (kg)

A: On average, each chicken lays eggs18kg per year.

42. Solution: 4×(6- 1)

=4×5

=20 (tree)

A: At least 20 poplars have been planted on all sides.

43. A travel agency offers two schemes, A and B, for a one-day trip to the West Lake. Each tour group can only purchase tickets according to one scheme.

Type A: each group with more than 5 people 150 yuan.

Type B: adult 200 yuan, child 100 yuan.

(1) 10 Parents take five children for a one-day trip to the West Lake. Which ticket is cheaper? How much will it cost at least?

Solution: A species: 150×( 10+5)

= 150× 15

=2250 (yuan)

Type b: 10× 200+ 100× 5.

=2000+500

=2500 (yuan)

2250 & lt2500

A: It's cheaper to buy tickets. At least 2250 yuan.

(2) What if five parents have 10 children?

Solution: A species: 150×( 10+5)

= 150× 15

=2250 (yuan)

Type b: 5×200+ 10× 100.

= 1000+ 1000

=2000 yuan

2250 >2000

A: it's cheaper to buy ticket B.

44. Solution: 3×35×4

= 105×4

=420 (person)

A: There are 420 people attending the Ocean Museum in the sixth grade.

45. The distance between Party A and Party B is 8800 kilometers. One car travels from Party A to Party B at a speed of 78 kilometers per hour, and the other car travels from Party B to Party A at a speed of 65 kilometers per hour. How many kilometers are the two cars separated from each other after four hours?

Solution: 8800-( 78+65)×4

= 8800-572

=8228 km

A: The distance between the two cars is 8228 kilometers.

46. Solution: 78×(3+ 1)+62×3.

=78×4+ 186

=3 12+ 186

=498 km

A: The railway between the two places is 498 kilometers long.

47. Solution: 65×3+62×3

= 195+ 186

=38 1 (km)

Answer: After 3 hours, the distance between the two cars is 38 1 km.

48. Solution: 78(72+72÷2)

=378÷ 108

=3.5 hours

A: After 3.5 hours, the two cars met.

49. The speed of the car on the expressway (120km) × the time of the car on the expressway = the distance of the car on the expressway. ※

Finding the time to drive on the highway is the key: sharing a cage with chickens and rabbits.

Solution method: (580-6×80)÷( 120-80)

=(580-480)÷40

= 100÷40

=2.5 hours

20×2.5=300 km

The car traveled 300 kilometers on the expressway.

50, the same reason. ※

Solution: (2300-20×80)÷( 150-80)

=700÷70

= 10 (minutes)

10×150 =1500 (m)

A: Xiaoming started running at a distance of1500m from the school.