Happy times are always so short. The summer vacation passes quickly, and the new semester is coming. In the new semester, I want to be happy every day. The following is the answer to my fourth grade math summer homework, hoping to help you finish your homework!
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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)? 6 (2)60-(24+30)? 6 (3)60-(24+30? 6)
=(36+30)? 6 =60-54? 6 =60-(24+5)
= 66? 6 =60-9 =60-29
= 1 1 =5 1 =3 1
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3)204? 3=68 (tree) pears
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? 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? 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 (wire length, also known as rectangular perimeter)
24? 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)
Answer: The people who watch movies should be students in Grade One and Grade Two.
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8+4+2? 6=24 8? 6? (4-2)=24 8? 4-6-2=24
6? 2? (8? 4)=24 (8? 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? (60? 25)
=4500? 1500
=3 kg
A: Each bottle of salad oil weighs 3 kilograms.
5)(66+7 1+63+72+76+69+64+74+68+77)? 10
=700? 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? Company 98,99? 102 and 102? 98+ 102, 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? (74-3
34) 126? 5-780? six
=480? 40 =630- 130
= 12 =500
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4)6480? 80=8 1 (days) 6480? (80+ 10)=6480? 90=72 (days) 8 1-72=9 (days)
A: It actually took nine days less than originally planned.
5) 120? 4=30 pieces 105? 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)? 25
=225? 25
=9 (box)
There are 9 boxes more apples than pears.
Expand and explore:
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)？ (English-French) =G
5)(25-5)? 300? 25 or 300-300? 5? 25
=20? 300? 25 =300- 1500? 25
=6000? 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? 2 or =( 1+ 19)? 2? ( 1+ 19)? 2
=20? 10? 2 = 10? 10
=200? 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? ( 10- 1)
=95.4? 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
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