Send charcoal in the snow

Send charcoal in the snow

Send charcoal in the snow - it's very cold in the snow. Send charcoal to warm others. It means to give support or help when others are in urgent need
His action is like sending charcoal in the snow, which has given us great help
2. During the summer vacation, our family went out to travel, but we forgot the flowers on the balcony. Fortunately, the thunderstorm in summer sent charcoal in the snow, otherwise, the flowers would have withered
In the most difficult period of the Anti Japanese War, the arrival of Bethune was undoubtedly a timely help!

Solving the problem of the fifth grade
For example, what is the difference between 71.5 minus 0.5 and 18?
What is the difference between 71.5 minus the product of 0.5 and 18?
It's not a problem-solving method, it's a problem like this.

Look at what you want at last. That term is the symbol of the last operation
For example: 71.5 minus the product of 0.5 and 18, what is the difference?
The last step is to find the difference, which shows that subtraction is the last step
Cough, waste expression
It's not easy. You just need to change different numbers and ask. What's the difference? What's the product? What's the quotient? What's the sum?
There will be

Application of several equations in the fifth grade of primary school
They are all solved by equations
1. A total of 182 students from a certain school participated in the science and technology group of the children's palace. Among them, boys are 1.6 times as many as girls. How many boys and girls are there?
2. Xiao Ming and Xiao Ying set out from 1240 meters away and walked in opposite directions. Xiao Ming's speed was 80 meters per minute and Xiao Ying's speed was 75 meters per minute. How many minutes did they meet?
Column relation

1. Set X for girls and 1.6x for boys
X+1.6X=182
2.6X=182
X=182/2.6
X=70
70*1.6=112
There are 112 boys and 70 girls respectively
2. Set the distance between two people after X minutes
X(80+75)=1240
155X=1240
X=1240/155
X=8
After eight minutes, they met

Practical problems (with process and formula)
1. The cars produced by an automobile factory in Beijing in January just account for 1 / 9 of the annual planned output. How many cars does this automobile factory plan to produce this year?
2. There are 240 male workers in a factory, one fifth of them is just one sixth of the total. How many workers are there in this factory?
3. With a 64 cm long steel welded into a 8 cm long, 5 cm wide cuboid frame, how many cm high?
4. There are 42 female athletes in the experimental primary school track and field team, which is equivalent to 7 / 9 of the male athletes. How many athletes are there in the experimental primary school track and field team?
1. The cars produced by a car factory in Beijing in January account for just one ninth of the planned annual output. How many cars does the car factory plan to produce this year? The car factory will produce 3200 cars in January

1. Suppose the number of cars produced in January is X
It is planned to produce 9x cars in the whole year
9 * 3200 = 28800
2. 240 △ 5 × 60 = 2880 persons
3. (64-8 * 4-5 * 4) △ 4 = 3cm
4. There are 42 male players (7 / 9) = 54
The experimental primary school track and field team has a total of 54 + 42 = 96 people
Have a good time!

Simple calculation questions for Grade 6
Urgent request!

General review materials of mathematics in Grade 6 of primary school (6) [simple calculation]
Class: Name:
1、 (23 points)
10－2.65＝ 0.9×0.08＝ 528－349＝ 6＋14.4＝ 24÷0.04＝
12.34－2.3＝ 0÷3.8＝ 0.77＋0.33＝ 7÷1.4＝ 67.5＋0.25＝7.2÷8×4＝ 5－1.4－1.6＝ 400÷125÷8＝ 1.9×4×0.5＝
80×0.125= 3× = 6 6= 2 －( + )= 10 2=
3.2×7÷3.2×7= ( － )×12= 187.7×11－187.7= 1－ 62.5%=
2、 Write down the laws or properties of each of the following questions (12 points)
4 +3.2＋5 +6.8 25×(8×0.4)×1.25 7 －(2 － )
( ) ( ) ( )
( ＋ + )×72 93.5÷3 16÷2.5
( ) ( ) ( )
3、 It is calculated by a simple method
1125－997 998+1246+9989  （8700＋870＋87）÷87
  
 
125×8.8 1.3＋4.25＋3.7＋3.75 17.15－（3.5－2.85）
 
   
  
 
 
 3.4×99＋3.4 4.8×1.01 0.4×（2.5÷73）  
  
 
 （1.6＋1.6＋1.6＋1.6）×25 （ ＋ － ）÷
  
12.3－2.45－5.7－4.55 2 ＋ 0.125×0.25×64
 
 
 
64.2×87＋0.642×1300 78×36＋7.8×741－7 17＋ 8
0.125× ＋0.5 2.42 +4.58 －43
25÷100 4.25－3 －(2 －1 )
（1）1.25*17.6+36.1/0.8+2.36*12.5
1.25*17.6+36.1/0.8+2.36*12.5
=(5/4)*17.6+36.1*(5/4)+23.6*(50/4)
=176/8+361/8+236/8
=773/8=96.625
（2）7.5*2.3+1.9*2.5
7.5*2.3+1.9*2.5
=7.5*(1.9+0.4)+1.9*2.5
=(7.5+2.5)*1.9+7.5*0.4
=19+3 =22
（3）2004/2003*2005
2004/2003*2005
=(2004/2003)*(2003+2)
=2004+4008/2003
（4）276*543-267/276+543*275
276*543-267/276+543*275
=543*(276+275)-267/276
=543*551-267/276
（5）17/51+ （68/1+51/2）*17
17/51+ （68/1+51/2）*17
I can't do the following. It seems that there are some simple methods. I don't know if you have copied the title wrong. Is 68 in your 68 / 1 a numerator or denominator? It should be the denominator
(6) (3.25-0.8 * 8 / 5) / (6.4 / 1-3.5)
Is it 6 and 1 / 4? It should be 6 and 1 / 4
1) 45 + 159 × 47.56 + 79 and 20 × 52.44
=52.44×79.45+159×47.56+79.55×52.44
=52.44×(79.45+79.55)+159×47.56
=52.44×159+159×47.56
=159×(52.44+47.56)
=159×100
=15900
3)2002+2001-2000-1999+1998+1997-1996-1995+…… +2+1
=(2002-2000)+(2001-1999)+(1998-1996)+(1997-1995)+…… +(6-4)+(5-3)+2+1
=2+2+2+2+…… +2 + 2 (there are 2000 numbers from 3 to 2002, so there are 1000 2) + 2 + 1
=1000×2+2+1
=2003
Both questions 4 and 5 use a conversion 1 / (a × b) = 1 / (B-A) × (1 / A-1 / b)
If 1 / 15 = 1 / (3 × 5) = 1 / (5-3) × (1 / 3-1 / 5) = 1 / 2 × (2 / 15) = 1 / 15, it can be verified
4) (1 × 1 / 2) + (2 × 1 / 3) + (3 × 1 / 4) + +(1 / 10 × 11)
=1/(1×2)+1/(2×3)+1/(3×4)+…… +1/(10×11)
=(1-1/2)+(1/2 - 1/3)+（1/3 - 1/4）+…… +（1/10 - 1/11）
=1-1/11
=10/11
5) 1 / 3 + 1 / 15 + 1 / 35 + 1 / 63 + 1 / 99
=1/(1×3)+1/(3×5)+1/(5×7)+1/(7×9)+1/(9×11)
=1/2×(1-1/3)+1/2×(1/3-1/5)+1/2×(1/5-1/7)+1/2×(1/7-1/9)+1/2×(1/9-1/11)
=1/2×(1 - 1/3 + 1/3 - 1/5 + 1/5 - 1/7 + 1/7 - 1/9 + 1/9 - 1/11)
=1/2×(1-1/11)
=1/2×10/11
=5/11
6) One and half - five sixths + seven twelfth - nine twentieth + eleven thirtieth - thirteen forty second + fifteen fifty sixth
(according to the prompt, 1 and 1 / 2 = 1 + 1 / 2, + 1 / 2 + 1 / 3 = 5 / 6 )
=(1+1/2)-(1/2+1/3)+(1/3+1/4)-(1/4+1/5)+(1/5+1/6)-(1/6+1/7)+(1/7+1/8)
=1+ 1/2 - 1/2 - 1/3 + 1/3 + 1/4 - 1/4 - 1/5 + 1/5 + 1/6 - 1/6 - 1/7 + 1/7 + 1/8
=1+1/8
=9/8

Please give me 50 sixth grade mathematical problems

1. The current price of a piece of clothing is 60 yuan, making 20%. How much is the original price?
2. The volume of a square is 1 cubic decimeter. What is its edge length? What is the area of each side?
3. How many cubes need to be piled up with small square wood blocks with the edge length of 1 cm to form a cube with the edge length of 1 decimeter? How long is it to arrange these small cubes in a row?
5. Three times of a number is three times more than 35 of 45. Find the number? 6, 14 of a number plus 2.5, which is equal to 13, and find a number
6. How many meters is 17 meters longer than 637 meters?
7. What's the difference between 114 from the bottom of 223 and 13?
What is the quotient of the sum of 8.12 and 13 divided by their difference?
9. The two cars of Party A and Party B leave from two places 270 kilometers apart at the same time. After 1 hour and 30 minutes, the two cars meet. It is known that the speed ratio of car B to car a is 7:8. How many kilometers do the two cars travel per hour?
10. The first machine tool factory produces 891 machine tools this year, 10% more than last year. How many more than last year?
11. To build a canal, it took four days to build 380 meters. According to this calculation, it can be completed in another seven days. How long is the canal?
12. Four big cars carry 80 tons of coal five times, three small cars carry 72 tons of coal eight times. Now there are 350 tons of coal. How many times does it take for a big car and a small car to transport coal at the same time?
13. In the second quarter of this year, iron and steel plants produced 500000 tons of steel per month on average, 100000 tons more than in the first quarter. In the first half of this year, how many million tons of steel per month on average?
14. Xiao Wang rode 144 kilometers in two days, 40% more on the first day than on the second. How many kilometers did he walk in these two days?
15. A project can be completed in 50 days by Party A alone, and 75 days by Party B alone. Now two people work together, but Party B leaves for a few days in the middle of the project and finishes the project 40 days after the start of the project. How many days did Party B leave in the middle of the project?
16. Yucai School has 1250 students, of which 48% are girls. How many are boys?
17. What is the product of the difference between two and one-third and 1.5 multiplied by the difference between one-third and 0.2?
18. The ratio of a and B is 3:4, B minus a is 10.5, what is B?
19. There are 46 students going boating. Each big boat can seat 6 people, and the rent is 10 yuan. Each small boat can seat 4 people, and the rent is 8 yuan. How to save the most money and how much does it cost at least
20. Xiao Hong has several pieces of RMB 5 yuan and RMB 2 yuan. She wants to take out RMB 47 yuan. How many different ways can she take them?
21. 50% of a number is 24. What's 15% of this number?
22. The sum of 35.5% and 20% of a number is 44.4
What is the difference between 37.5% of 23.3% and 40% of 1 / 4?
What is the quotient of the sum of 24.3 1 / 4 divided by the product of 2.8 and 25%?
25. An engineering team invested 200000 yuan to complete a project, which saved 50000 yuan compared with the plan. What percentage did it save?
26. One side of the square is reduced by 30%, and the other side is increased by 3 meters to get a rectangle, which is equal to the area of the original square. How many square meters is the area of the square?
27. A cylindrical steel is 2 meters long. After it is cut into three sections on average, the surface area increases by 36 square centimeters, and the weight of each cubic centimeter of steel is 7.8 grams. How many kilograms of the original steel?
28. The length, width and height of a cuboid are 10cm, 8cm and 6cm respectively. Now cut off 1 / 4 of the length, width and height of the cuboid, and find out how many parts of the cuboid are cut off?
29. The ratio of walking speed between a and B is 7:5. They start from a and B at the same time and walk in opposite directions. They meet after 0.5 hours. If they start from a and B at the same time and walk in the same direction, how many hours does it take for a to chase B?
30. After cutting a 3 cm wide strip from a square piece of paper, cut a 4 cm wide strip from the long part of the remaining rectangular piece of paper. If the area of the strip cut twice is exactly the same, what is the side length of the original square piece of paper?
31. There is a group of pigeons, some of them are singing in the tree, and the other part is foraging on the ground. A pigeon on the tree said to the pigeons on the ground, "if one of you flies up, the pigeons on the tree are one third of the pigeons on the whole group. If one of you flies down, there are as many pigeons on and under the tree. How many pigeons are there on and under the tree?
32. Xiao Li goes from a to B by bike and Xiao Ming goes from B to a by bike. They go at a constant speed. It is known that they set out at 8 am at the same time. By 10 am, they are 36 km apart. By 12 noon, they are 36 km apart. The distance between a and B is calculated
33. Xiao Hong read a book called "mathematics story". On the first day, she read 1 / 6 of the whole book, and on the second day, she read 16 pages. At this time, the ratio of the pages she had read to the pages she had not read was 3:4. How many pages are there in this book?
34. The area of a flower bed is 6 square meters. If the length is increased by 1 / 3 and the width is increased by 1 / 4, how many square meters will the area increase now?
35.3/7 × 49/9 - 4/3
36.8/9 × 15/36 + 1/27
three