Answers to the fourth grade math summer homework in 2022
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1)( 1) due east, 45 degrees east of south (or southeast), 2, due east, 3.
(2) 50 degrees south by west (or 40 degrees south by west), due west, 3, 45 degrees south by west (or southwest), 2
(3) Movies
(4) From the bookstore, take 1 stop to the east of the park, then take 2 stops to the 45-degree library in the southeast, and finally take 2 stops to the east of the hospital.
2)( 1)(60-24+30)& amp； Leather; 60-(24+30)； Leather; 60-(24+30 & amp； Leather; 6)
=(36+30)& amp； Leather; 6 = 60-54 & amp； Leather; 6 =60-(24+5)
= 66 & leather; 6 =60-9 =60-29
= 1 1 =5 1 =3 1
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3)204 & amp； Leather; 3=68 (tree) ... pear tree
68×2= 136 (tree) ... peach tree
68+ 136+204
=68+( 136+204)
=68+340
=408 (Tree) … Three kinds of fruit trees
A: There are 136 peach trees and 408 three kinds of fruit trees in the orchard.
4) 1 16=20×( 1)+8×( 12)= =20×(3)+8×(7)=20×(5)+8×(2)
A: There are three ways to buy: ① 1 book Selected Fairy Tales and 12 book Tales of Scientists; (2) 3 selected fairy tales and 7 stories of scientists; (3) five selected fairy tales and stories of two scientists.
Expand and explore:
△ =93,▲=26,□=43,■= 14,☆=57,★=38。
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1)8 1,28, 124,6,90,27, 198,48,4 1
2)450-225 & amp； Leather; 5+ 135 25×7 1×4 99×425
=450-45+ 135 =25×4×7 1 =( 100- 1)×425
=450+90 = 100×7 1 = 100×425- 1×425
=540 =7 100 =42500-425
=42075
10 1×79-79 304+306。 Leather; 17-298
=( 10 1- 1)×79 =304+ 18-298
= 100×79 =322-298
= 7900 =24
3)1.56m.
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4) 6×4=24 (decimeter) ... Square perimeter (length of iron wire, also rectangular perimeter)
24 & leather; 2-8= 12-8=4 (decimeter) … Rectangular width
8×4=32 (square decimeter) ... Rectangular.
A: Its width is 4 decimeters and its area is 32 square decimeters.
5)3 1× 18=558 (person) 558-24=534 (person) 534=(274)+(260)
A: It should be the students in grade one or two who watch movies.
Expand and explore
8+4+2×6 = 248×6 & amp； Leather; (4-2)=24 8×4-6-2=24
6×2×(8 & amp； Leather; 4)= 24(8 & amp； Leather; 4+2)×6=24
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1)4.8 , 3.8 ,3.4 ,2.8 , 1.6
2) Score
Decimal 1.0 0.8 1.8
3)0.2 2.4 0.35 0.9 1. 15 1.2
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4)4 tons 500 kg = 4,500 kg
4500 & leather; (60×25)
= 4500 & leather; 1500
=3 kg
A: Each bottle of salad oil weighs 3 kilograms.
5)(66+7 1+63+72+76+69+64+74+68+77)& amp； Leather; 10
= 700 & leather; 10
=70 years old
A: Their average age is 70.
(8- 1)×4=7×4=28 (person) 8-2=6 (person)
(6- 1)×4=20 (person) 28+20=48 (person)
A: There are 28 people on the first floor and 48 people on the second floor.
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1) 102×98 and 100×98+2×98, 99× 102 and 102× 98+002, the other two companies.
2)( 1) , ,0. 1,0.0 1,0.00 1
(2) One thousandth, 0.00 1
(3) ,0.03
(4)5,76,854
(5)8.43, 8.43
(6) Ten o'clock, 0. 1 000, 0.00 1
3)480 & amp； Leather; 126×5-780 & amp； Leather; six
= 480 & leather; 40 =630- 130
= 12 =500
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4)6480 & amp； Leather; 80=8 1 (days) 6480 &; Leather; (80+ 10)=6480。 Leather; 90=72 (days) 8 1-72=9 (days)
A: It actually took nine days less than originally planned.
5) 120 & amp； Leather; 4=30 pieces105&; Leather; 3=35 (pieces) 30
A: Xiaohua's copying speed is very fast, with five more words per minute.
Expand and explore:
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1) 128，+，C，B，+，64， 125-25，C，A，B，×，50， 100，2
2)( 1)② (2)② (3)② (4)③ (5)③
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3)24×( 145+55)
=24×200
=4800 (yuan)
24×( 145-55)
=24×90
=2 160 (yuan)
A: It cost 4,800 yuan to buy these office desks and chairs, and it cost 2 160 yuan more to buy tables than chairs.
4)(600-375)& amp； Leather; 25
= 225 & leather; 25
=9 (box)
There are 9 boxes more apples than pears.
He is 1.46 meters tall and weighs 30.5 kilograms. He drank 0.06 kg of milk in the morning and bought a ballpoint pen for 3.25 yuan at noon.
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1)( 1)④ (2)② (3)③ (4)④
2) 20.36 0. 15 0.09 9.509
3) 0.4 0.8 1.8 2.7 3.4 4. 1 4.5
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4)(A+B)×(E-F)=G
5)(25-5)×300； Leather; 25 or 300-300× 5&; Leather; 25
= 20×300 & amp； Leather; 25 =300- 1500。 Leather; 25
= 6000 & leather; 25 =300-60
=240 units =240 units
A: It was originally planned to produce 240 washing machines every day.
Expand and explore:
(! )9+99+999+9999+99999+999999
= 10+ 100+ 1000+ 10000+ 100000+ 1000000
= 1 1 1 1 1 10-6
= 1 1 1 1 104
(2) 1+3+5+7+9+ 1 1+ 13+ 15+ 17+ 19
=( 1+ 19)× 10 & amp； Leather; 2 or =( 1+ 19)&； Leather; 2×( 1+ 19)& amp； Leather; 2
= 20× 10 & amp； Leather; 2 = 10× 10
= 200 & leather; 2 = 100
= 100
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1) 160.5 company 165 16.05 company 16.05 1.605 company 1.605 company.
0.605 even 0.605 60.5 even 60.5.
2)×,×,√, ×,×,√
3) This question is not good. There are too many qualified data to compare. Write down six at random and compare the sizes.
4)=，& gt，& gt，& gt，& lt,=
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5)8×25+8×(25-5)
=200+ 160
=360 kg
360 kilograms of pears and apples have arrived.
6)20×23+ 18
=460+ 18
=478 km
The artificial earth satellite flies 478 kilometers per hour.
Expand and explore:
1)2508-25.08=2482.92 (yuan)
A: You will find that this book is undercharged by 2482.92 yuan.
2) Because the decimal point is wrong by one place, the book is 95.4 yuan more, that is to say, the original number is expanded by 10 times, which leads to errors, and the book is 9 times more than the original number, so the original number is 95.4 &; Leather; ( 10- 1)
= 95.4 & leather; nine
= 10.6 (yuan)
A: He mistyped 10.6 yuan as 106 yuan.
3) Because, if you look at more digits: 8-3=5, and look at ten digits less than 90-60=30, the correct answer should be:
123.8+30-5
= 153.8-5
= 148.8 (yuan)
A: The correct answer to this account number is 148.8 yuan.
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1)0.4 15 5.2 180 0. 1 0.06 30 10 0.00503 10 42
2)3 ,4 20 ,2 1 48 ,47 1 ,0 9 , 10 17 , 16
3)×,×,×,×,√
4) Answer: The decimal number is: 630.05, and the correct pronunciation is: 630.05.
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5) 1 16+68+(68+ 16)
= 184+84
=268 pages
This story book has 268 pages.
6) 17×5×2
=85×2
= 170 (tree)
A: A * * * can plant 170 seedlings.
Expand and explore:
1)∠2= 180 -∠ 1= 180 - 135 =45
∠3=90 -∠2=90 -45 =45
∠4= 180 -∠5-∠3= 180 -40 -45 =95
2) 180 ,360 ,540 ,720 ,900 …
The sum of the interior angles of a polygon = (number of sides -2) × 180 (n ≥ 3)
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1)>，& lt，& lt，& lt，=，=，& gt，& gt,=
2)8 pieces of 0.8, 43 squares of 0.43, 6 squares of 2 cm and 2.6 cm.
3)
4)( 1) right angle (2)60(3) less than (4) isosceles right angle, 45
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5)5×(4- 1)8 & amp； Leather; 4=2 (meter)
=5×3
= 15 (minutes)
Answer: It takes 15 minutes to finish sawing, and each section is 2 meters long.
180 & amp； Leather; 6=30 (straight line)
(30- 1)× 120
=29× 120
=3480 cm
=34.8 meters
A: This guard of honor has 30 rows, which is 34.8 meters from beginning to end.
Expand and explore:
5 jiao =0.5 yuan.
5×( 1+0.5)
=5× 1.5
=7.5 (yuan)
Answer; At least it will cost 7.5 yuan money.
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1)5,7,8,5.2,260,7.85,6,40,3.55, 1,80,4.89,4,2,8,8.05
2)& lt； ，=，& lt，& gt，=，& lt
3) = 466.85 million ≈ 467 million = 769.0804 million ≈ 769 million = 20.608 billion = 20.608 billion.
= 97.08 million ≈ 97 million = 320.6 million ≈3.2 1 billion = 70.4009 billion ≈ 70.405438+billion.
4) 1 .67km >:1.4km >120km > 400m
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5) 1 ton =1000kg
1000。 Leather; 10×3.6
= 100×3.6
=360 kg
Answer: You can squeeze 360 Jin of peanut oil.
6) 1 hour 40 minutes = 100 minutes
0.25×100 = 25km
A: This bike is 1 hour, 40 minutes and 25 kilometers.
7)(24+20)×5 (24-20)×5
=44×5 =4×5
=220 sheets =20 sheets
Answer: One * * * has 220 small desks, and Class One has moved 20 more than Class Two.
Expand and explore:
∠ 1 =∠2 =∠3 =∠4 = 60 & amp； Leather; 2=30
∠5= 180 -30 ×2= 180 -60 = 120
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1)92 25 4 b c a c 28 1 128 72 34 100 34 2 76 67 33
2) Left 1 connects right 3, left 2 connects right 1, left 3 connects right 4, and left 4 connects right 2.
3)+ , 5 , 5 , 8 , × , 125 , 2 , ×
Pupils' summer study plan is simple.
The next semester of 20__ has already started. Do the students have any new study plans? Yes, I do. I made the following study plan to remind myself to study hard in the future.
First, read for half an hour every day. Our teacher Wu is right. If you want to get good grades in Chinese, you should not only master the content and knowledge in the text, but also read more extracurricular books.
Second, take every assignment seriously. Chinese homework should be written neatly; Math homework should not be sloppy, and it should be checked after completion; English homework is written neatly. Read more and listen more.
Third, every Saturday afternoon, seriously learn the skills of playing chess from the coach, and usually practice more endgames, play more chess and summarize more.
Fourth, I want to exercise. I like playing table tennis. I continue to have table tennis lessons every Sunday morning, with the goal of beating my mother.
Finally, I also arranged to play computer for one hour on Saturday and Sunday. If I behave well, my mother will definitely agree.
Students, do you think my study plan is interesting? I must work hard for the set goals!
Diary of summer vacation travel
I have always heard from my classmates that Qiandao Lake is a beautiful place. Today, I finally saw it. Although my clothes were soaked by the hot sun, it didn't affect my good mood of playing ball. We boarded the "Qinyuan No.25" cruise ship, and I cried excitedly when I saw the green lake and groups of islands. It's beautiful.
The first stop, we came to Meifeng Island. I saw a python. Many people hang it around their necks to take pictures. That mangy snake doesn't look so terrible. I even touched it gently after using it. It's cool and has small scales. We took the cable car to the top of the mountain, where we could see the whole lake. It's beautiful and spectacular. At the second stop, we went to Christmas Island. There is a special fish pond on this island. There are many red carp in the fish pond. Many people are feeding the small fish, and the fish are fighting for food.
There is also a jet ski on the island. I really want to play, but I am too young to play such a dangerous sport, but I will definitely come to play in the future. We had lunch on this island. I have never seen such a scene. Because it was a buffet, everyone rushed to eat. Because people ate too much, they were robbed as soon as they came up. I only ate some soybeans. Although this made me very unhappy, I soon forgot that we were going to the last island-Longshan Island. After a day's trip, we came to the 70 commune in Longchuan bend, which is simply a paradise. I haven't seen much. My mother said, "These are what they saw when they were children." We will stay here at night.
The first thing I said to my mother the next morning was, "Mom, I'll come again next time."
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