Used to make stool legs. How high is this stool? Page 6 of the book Question 6 2 meters = 20 decimeters

20÷4 = 5 (decimeter)

The height of this stool is about 5 cm.

Mom took Xiaoming to see her grandmother by long-distance bus, and she had to leave halfway.

308 kilometers. They set off at 8 am, and the bus travels at an average speed of 80 kilometers per hour. Can you arrive at noon 12? (Question 6 on page 10 of this book)

12 hours -8 hours =4 hours

80× 4 = 320km, 308km < 320km

A: Arrive at noon 12.

3. Three sets of 600 kilograms were loaded on a truck with a load of 2 tons.

Is the machine overloaded? (Question 2 on page 12 of the book) 2 tons = 2000 kg.

600×3 = 1800 (kg)

A: No overweight.

There are five machines, weighing 600kg and 400kg respectively.

800 kg, 1000 kg, 700 kg, these machines are transported by two trucks with a load of 2 tons. How can they be loaded and transported at one time? (Question 3 on page 13 of this book)

2 tons = 200 kg per set:

600+400+800= 1800 (kg) Another set:

1000+700 = 1700 (kg)

Answer: One set contains 1 800 kg and the other set contains 1 700 kg, which can be transported at one time.

5. A globe, 85 yuan and a schoolbag, 48 yuan. How much does it cost to buy a globe and a schoolbag? (Question 2 on page 17 of this book)

85+48= 133 (yuan)

Answer: Buy a globe and a schoolbag.

* * * 133 yuan.

6. There are 59 cocks, 77 hens and 85 chickens. (1) How many hens are there? (Question 3 on page 17 of this book)

59+77 = 136 (only)

Answer: rooster hen 136.

(2) What other math questions can you ask?

① Question: How many cocks, hens and chickens are there? 59+77+85 = 22 1 (only)

Answer: There are 22 1 rooster, hen and chicken.

② Question: How many cocks are fewer than chickens? 85-59 = 26 (only)

Answer: There are 26 fewer cocks than chickens.

③ Question: How many roosters and hens are there than chickens?

59+77-85 =136-85 = 51(only)

Answer: Rooster hen * * * is 5 1 more than chicken.

7. The Beijing-Guangzhou Center Building is 209 meters high and 196 meters short. Do you know how high the CCTV tower is? (Question 4 on page 19 of this book)

209+ 196 = 405 (m)

A: The CCTV Tower is 405 meters.

8. It is 5 17 kilometers from Kunming to Lijiang. We have walked 348 kilometers. How far is it to Lijiang? (Page 23 of this book) 5 17-348 = 169 (km)

A: There is still 169 km to Lijiang.

9. The grocery store shipped 4 10/0kg of eggs, sold152kg in the morning and174kg in the afternoon. How many kilograms are left? (Question 2 on page 125 of this book)

410-152-174 = 258-174 = 84 (kg) Step by step (Method 2):

Sold: 152+ 174 = 326 (kg)

Remaining: 4 10-326 = 84 (kg) A: There are 84 kg left.

10. There were 852 tourists in the Science Park in the morning and 265 people left at noon. In the afternoon, 403 tourists came again. How many tourists are there in the park? How many tourists come to the park all day? (Question 3 on page 25 of this book)

(1)852-265 = 587 (person) 587+403 = 990 (person)

(2)852+403 = 1255 (person)

A: At this time, there are 990 tourists in the park. All-day tourists 1255 people.

1 1, Xiaoming's home, Xiaohong's home and school are on the same road. Xiaohong's home is 3 12 meters away from school. Xiaoming's home is only 155 meters away from school. How far is it from Xiaoming's house to Xiaohong's house? What may be the location of their two houses and schools? (Question 6 on page 26 of this book)

Two situations:

The first one is on the same side of the school: 312-155 =157 (m).

The second case: both sides of the school: 3 12+ 155 = 467 (meters).

A: There are two situations from Xiaoming's house to Xiaohong's house. The same side of the school157m, and the two sides of the school are 467m.

12, a set of sportswear 135 yuan, a pair of sports shoes 48 yuan, my mother gave it to the shop assistant 200 yuan, how much should I get back? (Pages 27 and 28 of this book)

Money spent: 135+48 = 183 (yuan). Return: 200-183 =17 (yuan).

Or: 200- 135-48 = 17 (yuan)

A: You should take back 17 yuan.

13. There were 205 people on the passenger ship, 79 people disembarked and boarded the ship 128 people. How many people were on the passenger ship when we set sail again? (Question 6 on page 30 of this book)

205-79 = 126 (person) 126+ 128 = 254 (person)

A: There were 254 people on the passenger ship when we set sail again.

14. Chickens hatched 900 eggs, 337 chicks hatched in the morning, and more chicks hatched in the afternoon than in the morning 1 18. (Question 2 on page 33 of this book)

(1) How many chicks are hatched in the afternoon? 337+ 1 18=455 (only)

(2) How many chicks hatched on this day? 337+455 = 792 (only) (3) How many eggs are left?

900-792 = 108 (only)

15, rectangular flower bed is 5m long and 3m wide. What is the circumference of this flower bed?

(5+3)×2 formula: (length+width )× 2 = rectangle perimeter =8×2.

= 16 (m)

A: The perimeter of this flower bed is16m.

16. The side length of a handkerchief is 2 decimeters. Can a 90 cm long ribbon go around?

2 decimeter =20 cm, 20×4 = 80 cm, circumference = side length × 4 80 cm

A: You can use a 90-cm-long ribbon to make a circle. Or 2×4 = 8 (decimeter) 90 cm =9 decimeter.

8 decimeters < 9 decimeters

A: You can turn around.

17. Use two squares to make a rectangle with a side length of 1cm. What is the circumference of this rectangle?

Length: 2cm width: 1cm (2+ 1)×2 =3×2.

=6 cm

The circumference of this rectangle is 6 cm.

18, rectangular vegetable field, 6 meters long and 3 meters wide. Fence it up. How long is the fence? If one side is against the wall, how many meters is the fence at least?

(1) (6+3) × 2 (2)18-6 =12 (m) =9×2 rectangle perimeter = 18 (m)

Answer: The fence length is18m; If one side is against the wall, the fence should be at least12m.

19, with 29 blades, each electric fan is equipped with 3 blades. How many electric fans can these blades hold?

29÷ 3 = 9 (Taiwan Province) 2 (movie) answer; These blades are enough for 9 electric fans.

20. The side length of a regular octagon is 3 cm. After a circle with a ribbon, there is an extra 2 cm. How long is this ribbon?

3×4 = 12 (cm) side length× 4 = square perimeter 12+2 = 14 (cm)

This ribbon is *** 14 meter long.

2 1, there are 32 people skipping rope, and there are 6 people in a group. Can be divided into several groups, a few more people?

32÷6 = 5 (group) 2 (person)

A: It can be divided into five groups, and there are two more people.

22. How many bottles can I buy for each bottle of mineral water from 3 yuan and 20 yuan? How many are left?

20÷3 = 6 (bottle) 2 (yuan)

A: Buy six bottles at most, and there is 2 yuan left.

23. A rope is 19 meters long, cut 8 meters to make a long skipping rope, and make a short skipping rope every 2 meters. How many short jump ropes can you make? How many meters are left? 1 9-8 =11(m)1÷ 2 = 5 (root)1(m) A: You can make 5 short jump ropes, and there is/kloc-left.

April has 30 days. Page 56 Question 3( 1) How many weeks are there in April, and how many days are there? 30÷7 = 4 (pieces) 2 (days)

(2) If April has five Saturdays and Sundays, when is April 1?

A: Saturday.

25.23 How many children's books can I buy for every 4 yuan? How much is left? What about 25 yuan?

23÷4 = 5 (Ben) 3 (Yuan) 25÷4 = 6 (Ben) 1 (Yuan)

A: 23 yuan can buy up to 5 copies, leaving 3 yuan;

25 yuan can buy six copies at most, leaving 1 yuan.

26. There are nine empty tables in the Forest Restaurant. Each empty table can be used as four small animals. At noon, 35 small animals came. Do they all have seats? Method 1: 4× 9 = 36 (only)

36 >； 35

A: Everyone has a seat.

Method 2: 35 ÷ 4 = 8 (Zhang) 3 (only) A: Everyone has a seat.

27. There are 20 small animals living in the forest castle, 6 in each room. A * * * can fill several rooms. How many small animals are left?

20÷6 = 3 (rooms) 2 (only) A: One * * * can fill 3 rooms, leaving 2 small animals.

A bunch of flowers, how many such flowers can these flowers be tied into at most? 22÷7 = 3 (bundle) 1 (branch) 16÷3 = 3 (bundle) 1 (branch) 10÷2 = 5 (bundle)

These flowers can be tied into three bundles at most.

Tip: Because seven chrysanthemums, three Chinese rose flowers and two tulips need to be tied into a big bundle, the extra ones can't be tied into a bundle as required, so it's useless, so they can only be tied into three big bundles.

29. A train should arrive at 1 1: 20, and now it will be 25 minutes late. What time does it arrive?

11:20+25 = 1 1:45a: Here we are11:45.

30.9 How much does it cost to ride a merry-go-round for 2 yuan? 10 How many people are there?

2×9 = 18 (yuan)

A: Nine people need 18 yuan, and 10 people need 20 yuan.

3 1.20 How much does it cost to get to 3 yuan by bumper car? 3×20 = 60 (yuan)

A: People want 60 yuan.

Is it enough for 29 students to visit 250 yuan to 8 yuan per ticket?

8× 29 = 232 yuan 250 yuan >: 232 yuan.

A: Money with 250 yuan is enough.

33. How much does it cost to buy 20 bottles of mineral water per bottle of 2 yuan? 2×20 = 40 (yuan)

You need 40 yuan to buy 20 bottles.

35. A box of apples is 30 kilograms. How many kilograms are there in eight boxes? 30×8 = 240 (kg) Answer: 8 cases have 240 kg.

36. A box of film can take 36 photos. How many photos can three boxes of film take?

36×3≈ 120 (sheet)

A: Three boxes of film can take about 120 photos.

37. Four rows of willows, 62 in each row, were planted by the lake. How many trees are there in a * *?

62×4≈240 (sheets)

A: A * * * has about 240 trees.

38. An article is 400 words. Uncle Xiaoding types 53 words per minute on average. Can you finish it in 8 minutes? 53×8≈400 (piece)

A: It will be completed in 8 minutes.

39. The price of each children's tricycle is 90 yuan. I bought four cars in kindergarten. How much is a * * *? 90×4 = 360 (yuan)

A: I used 360 yuan.

40. There is a Siberian tiger in the zoo, weighing 2 13kg. Bison is three times as heavy as Siberian tiger. How much does this bison weigh?

2 13×3 = 639 (kg)

This bison weighs about 639 kilograms.

4 1. Flowers are placed on both sides of Park Road, with 342 pots on each side. How many pots are placed on each side?

342×2 = 684 (basin)

A: Put 648 pots on each side. 42. A building * * * has 6 units, each unit 18 households. How many families live in this building? 18×6 = 108 (household)

A: There are 108 families living in this building.

43. There are 24 bottles in each box of drinks. How many bottles are there in 9 boxes? 24×9 = 2 16 (bottle)

Answer: 9 cases -2 16 less bottles.

44. The stands of the sports ground are divided into eight areas, each with 634 seats. How many people can the stadium hold at most?

634×8 = 5072 people

This stadium can hold 5072 people.

45. Four films are shown every day. A maximum of 278 tickets are sold for each game. How many people can watch movies at most every day? 278× 4 =1112 (person)

A: At most 1 1 12 people can watch movies every day.

46. At the entrance ceremony of the Asian Games, the crowd was divided into four phalanxes, each with 128 people. How many people are there in a square? 128×4 = 5 12 (person) A: A * * has 5 12 people.

A grasshopper 47, 5 cm long can jump 75 times its length at a time. What is the distance it jumps at a time? 5×75 = 375 cm

A: The distance it jumps at a time is 375 cm.

48. Each student will get five exercise books. There are 52 students in Class One, Grade Three. How many exercise books will be distributed in a class? 5×52 = 260 (Ben)

A: A * * * will distribute 260 exercise books.

49. Xiaohong rides 185 meters per minute on average. She goes to school for seven minutes every day What is the distance between Xiaohong's home and school? 185×7 = 1295 (m)

A: The distance between Xiaohong's home and school is 1295 meters.

50. A train has 9 carriages, and each carriage has 1 18 seats. How many seats are there in this train? 118× 9 =1062 (pieces)

Attendant: This train has 1062 seats.

300 students went for an outing in four cars. There are 78 students in each of the first three carriages. How many students does the fourth car take?

Number of people in three carriages: 78×3 = 234 (person) Number of people in the fourth carriage: 300-234 = 66 (person) A: There are 66 students in the fourth carriage.

52. Female students of Children's Palace Band 18, male students 17. There are three times as many people in the chorus as in the band. How many people are there in the choir?

Band number: 18+ 17 = 35 (person) Chorus number: 35×3 = 105 (person) A: There are 105 chorus members.

53. The birthday girl walks around the lotus pond three times a day, each time 508 meters. How many meters does the birthday girl walk every day? 508×3 = 1524 (m)

A: The old birthday girl walks 1524 meters every day.

Last year, our school planted 205 trees voluntarily, twice as much as last year. How many trees will be planted voluntarily this year? 205×2 = 4 10 (tree)

A: This year, 4 10 trees were planted voluntarily.

The weight of an elephant is equivalent to the weight of eight cows. A cow weighs 605 kilograms. How much does this elephant weigh? 605×8 = 4840 kg

The weight of this elephant is 4840 kilograms.

56. The school library bought three sets of "Little Scientists" series, each set of 280 yuan. How much is a * * *? 280×3 = 840 (yuan)

I need 840 yuan. 57. One silkworm spins about 1500m, and the little red six silkworms. How many meters did it rotate?

1500×6 = 9000 (m) A: spinning is about 9000 meters.

58. The school bought four electric fans, each 140 yuan. How much does it cost to buy a * * *?

140×4 = 560 (yuan)

A: I want to use 560 yuan.

59. Uncle Wang Can inspected 230 parts in 1 hour on average. He works eight hours a day. * * * How many parts can I check? 230×8 = 1840 (piece)

Answer: * * * can detect 1840 parts.

60. Xiaojun walks about 65 meters per minute. It takes him about 8 minutes to walk from home to school. How far is his home from school? 65× 8 = 520m

His home is about 520 meters away from the school.

6 1, each set of tables and chairs seats two people, and the school bought 200 new sets of tables and chairs. A * * *, how many people can sit? 200×2 = 400 (person)

A: A * * * can seat 400 people.

62. Students of all grades in Sunshine Primary School 136. How many students are there in six grades?

136×6 = 8 16 (person)

A: There are 8 16 students in six grades in the school.

63. A hare runs 4 1 km per hour, and the swift flies four times as fast as the hare. How many kilometers does this swift fly per hour? 41× 4 =164km

A: The flying speed of this swift is about 164 kilometers per hour.