6th grade fraction division application 5

Let's leave 16 kilograms of apples.

It turns out that the apple has 16 (4 5) = 20 kilograms, and the basket weighs 25-20 = 5 kilograms.

Safflower is 2 to 5 units of yellow flowers"1"The amount is 2 3 of the number of boys (the number of yellow flowers) is equivalent to the number of girls. units"1"The number of girls is 3 5units"1"The amount is (the number of boys).

Divide by (1-1 5) = 16 * 5 4 = 20 kg, 25-20 = 5 kg, apples 20 kg, basket 5 kg.

2.Polygala. 3.Number of female students.

4.Number of boys.

Apples 20 kg Basket 5 kg (1-1 5) x = 16 x = 20 25-20 = 5

The remaining question is what is the unit "1"?Interpretation.

The remaining 4 5 apples are 16 kg of the original apples 16 divided by 4 5 = 20 kg and the basket weight is 25-20 = 5 kg

Polygala. Schoolboy. Schoolboy.

The title is not very clear, 1 is 1 5 apples, so the result is 16 (4 5)=20kg, which means that 16kg of apples accounts for 4 5

2 is the weight of 1 5, that is, after selling 1 5, there are 20kg left, and there are 16kg of apples in it, and the basket weighs 4kg, so the original apple is 21kg

What do you mean by the following title? Let the yellow flower be x, then the red flower is 2 5x, so x+2 5 x=1 can know that x is 5 7 The following problem is similar.

16 divided by 4 5 = 20 kg.

25-20 = 5 kg.

Yellow flower, number of boys, number of boys.

1.If you like to use both arithmetic and equations, then please remember the following tips:

First grasp the fractional rate sentence, then set the unit "1", write the relation, and the solution is self-distinct.

Please look at the following examples.

1) There are 50 watercolors, there are more crayon drawings than watercolors, how many crayon paintings are there?

2) There are 80 crayon paintings, there are more crayon drawings than watercolors, how many watercolors are there?

According to this sentence, we can see that both questions regard the number of watercolor paintings as the unit "1". From this we can write the following relation:

Number of watercolor paintings: 50 (1+) = number of crayon drawings.

Then put the known quantities in the two questions under the relation:

Number of watercolors (1+) = crayons. Quantity.

Number of watercolors (1+) = number of crayon drawings.

Obviously, the unit "1" in question (1) is known, that is, what is (1+) of 50. The column formula is 50 (1+).

The unit "1" of question (2) is unknown, so it can be set to x, and then it can be solved according to the relational equation. i.e. x (l+) = 80.

2.If you want to solve it using arithmetic methods, then please remember the following song tips.

First grasp the score rate sentence, and then set the unit "1".

Distinguish between multiplication and division, and the amount rate should correspond.

To be more specific, the following is the law.

1) The unit "1" is known and is calculated by multiplication.

Method: Unit "1 The corresponding fraction of the quantity sought = the quantity sought.

2) The unit "l" is unknown and is calculated by division.

Method: Known Quantity The corresponding fraction of known quantity = unit "L".

When applying the above rules, students should remember: to do multiplication, to grasp the question, what to ask, use the unit "l" multiplied by its corresponding fraction. To do division, you should grasp the known quantity, and divide the part of the known quantity by the corresponding fraction of this part.

Example 1, Yucai Primary School has a total of 1,500 students, the number of fifth grade students accounts for the whole school, and the number of sixth grade students accounts for the whole school.

How many students are in grades 5 and 6?

For this question, we consider 1500 students (the number of students in the whole school) as the unit "L". The unit "l" is known and is calculated by multiplication. It is necessary to grasp the question and find the corresponding fraction of the quantity sought, that is, to find.

The number of students in grades 5 and 6 makes up a fraction of the total school size.

This score question doesn't tell us directly, you can use + to find it. So this question should be 1500 (+

For another example, if there are several tons of fertilizer in the warehouse, the total number shipped out on the first day, and the total number shipped out on the second day, there are still 49 tons left, how many tons of fertilizer are there in the warehouse?

In this question, we consider the total amount of fertilizer in the warehouse as the unit "1", the unit "1" is unknown, and it is calculated by division. To do division, we should grasp the known quantity and find the corresponding fraction of the known quantity. The only known quantity in the problem is 49 tons, and the corresponding fraction of 49 tons must be found, which is 1--。

So the equation for this question should be 49 (l--).

It is generally divided into three situations, 1. In the first case, all fraction division problems are to find the unit 1 first, that is, who regards whom as the unit 1, without the meaning of more or less, directly use the division method to find the amount of unit 1.

2. In the second case, compare who regards whom as a unit, and then see how many fractions more than whom, divide by the corresponding amount of a few fractions more, (1 + a few fractions) to find the amount of unit 1.

3. The third case: it is still better than who regards whom as unit 1, and then looks at a fraction less than unit 1, divide the corresponding amount of a fraction less by (1-fractions), and calculate the amount of unit 1.

For the division calculation of fractions. You just need to follow a principle of dividing by a number, which is multiplied by its reciprocal number, so the following fraction only needs to be reversed in numerator and denominator, and then the calculation is correct.

The elementary school fraction division problem is transformed into multiplication and solved with equations. The key is to analyze the equiquantity relationship, according to: who fractions of whom, list the equations, and then solve them.

There are mainly the following types of fraction application questions in the first volume of the sixth grade of primary school.

What is the fraction of a? With an A score.

A is a fraction of B? With a b

A is a fraction of B, what is A? Use a B score.

A is a fraction of b, how much is b? With an A score.

The key to decimal multiplication and division problems is to be able to list the quantitative relations according to the key sentences, and it is important to understand the meaning of the question and understand the relationship between quantities. Segment diagrams can be used to help understanding.

In general, there are two main categories: multiplication of the known whole; Divide the known parts for the whole!

Fraction application questions are the same as integer decimal numbers, and the question type is in contact with the fourth grade. It is recommended to find systematic data and analyze them one by one to finally solve the problem.

I'm also in 6th grade, pretending.

b What! ......

The ratio of the number of students in the sixth grade to the fifth grade is: 3 4:4 5 = 15:16 (when the two numbers are equal in parts, the ratio of the two numbers is equal to the inverse ratio of the scores of the two parts) weight.

The sixth grade has: 930 * 15 (15 + 16) = 450 people in the fifth grade: 930 * 16 (15 + 16) = 480 people Solution 2:

If there are x students in the fifth grade, then the sixth graders have (930-x) 3 4x = 4 5 (930-x).

3/4x=744-4/5x

4/5+3/4）x=744

x=480930-x=930-480=450

Solution: There are x people in the fifth grade.

It is known that three-fourths of the five-year version is four-fifths of the sixth-year version, then the sixth grade is entitled to (5 4) * (3 4) x people.

Then five plus six years total people 930 = x + (5 4) * (3 4) x solution to get x = 480 (people).

Hello, I hit it with my phone! I hope you choose me.

5th grader.

3 4 of the BAI number = 4 of the number of people in the sixth grade 5 12 16 of the number of DAO people in the fifth grade = 12 15 of the number of people returning to the sixth grade is 16 parts in the fifth grade, and 15 copies in the sixth grade.

per serving; 930 (15+16)=30 (person) 5th grade: 30x16=480 (person).

6th grade: 30x15=450 (person).

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Solution: Set up x people in the fifth grade.

3/4x = (930-x).

4/5 x = 120

6th grade: 930-120 = 810 (person).

Solution: Set five. Grade x people.

3/4 x = (930-x) 4/5

x=480 6th grade: 930-480=450 (person).

There are x people in the 5th grade and y people in the 6th grade.

Braces:

3/4x=4/5y

930=x+y

The solution is x=480

y=450 so there are 480 in grade 5 and 450 in grade 6.

5th grade: 930 (1+3 4 4 5)=480 students.

Sixth grade: 930 480 = 450 students.

, practical questions, 4 points per question, a total of 16 points.

1. The washing machine factory produced 5,400 washing machines last year, 600 more than planned, and the actual internal production increased by a few percent compared with the plan?

2. Pingshan Primary School repairs a circular flower bed with a circumference of meters, and a 2-meter-wide circular path around the flower bed, how many square meters is the area of this long path?

3. A color TV, if you reduce the pricing of 10 **, you can make a profit of 215 yuan, if you reduce the pricing of 20 **, you will lose 125 yuan. How much is the price of this kind of color TV?

4. The circumference of the inner circle of the new runway of Dexing Primary School is 200 meters, each track is wide by meters, and now it is a 400-meter race, and each runner can only run along his own track, so how many meters should the starting point of the sixth track be before the starting point of the third track?

7. Read the certificate of deposit and solve the problem. 10 points.

Deposit Date: Deposit Period: Maturity Date: Annual Interest.

December 1, 2007 3 December 1, 2010 Account Number: 32333989 Account Name: Chen Haolin Deposit RMB:

30,000 yuan Yiming Savings Bank (sealed) If the certificate of deposit expires, how many yuan can Chen Haolin receive in total for principal and interest?

1. Due to the improvement of equipment, the daily output of a chemical plant has increased from 40 tons to 60 tons, an increase of several percent?

2. A certain TV set.

Returned to the factory to produce 4,800 TVs, including 4,608 qualified products, and asked for the qualified rate and scrap rate of TVs?

3. In a troop shooting exercise, 100 bullets were hit, and 25 were missed, what was the hit rate?

4. There are 250 employees in the garment factory, and 248 people are in attendance today. What is today's absenteeism?

5. Dissolve 25 grams of salt in 100 grams of water to find the salt content of the brine.

6. A piece of tin and lead alloy weighs 45 kg, of which lead is 27 kg, find the lead content of this alloy.

7. An expedition team originally planned to travel 40 kilometers a day and reach its destination in 8 hours, but due to work needs, it traveled an extra 10 kilometers a day, and the actual time taken was reduced by how many percent?

8. To do the same job, team A completes it in 4 hours, team B completes it in 5 hours, and team A's work efficiency is fraction of that of team B?

9. A car travels 40 kilometers per hour from A to B and 10 kilometers per hour when returning, how many points does the speed increase?

10. If you increase a number by 25%, how many percent of the obtained number should be reduced to get this number again?

1. There is a group of teachers and students who go to the movies, 20% of the total number of students go in for the first time, and the remaining five-eighths of the second time they go in, and there are 195 people left waiting for the third batch, with a total of several teachers and students.

1. A car from Chengde to Beijing, to travel the whole way, according to Beijing 64 kilometers. How many kilometers is there from Chengde to Beijing? Answer: 1 =

64 = 256 (km).

A: Chengde to Beijing is 256 km2

A daily chemical plant produced 9,800 cases of laundry soap in June, three-sevenths more than planned. How many boxes of laundry soap do you plan to produce? Answer:

1 + 3/7 = 10/7.

9800 10/7 = 6860 (box).

Answer: It is planned to produce 6860 boxes of laundry soap3, and the toy factory plans to produce a batch of toy cars, which has completed four-fifths of the plan. How many toy cars are there? Answer: Solution: It is planned to produce x toy cars.

x four-fifths x = 190

One fifth x = 190

x=190 one-fifth.

x=950A: It is planned to produce 950 toy cars.

Answer: 1 4/5 = 1/5.

190 1/5 = 950 (units) Answer: It is planned to produce 950 toy cars. 4. Uncle Zhang picked a small cart of watermelons, and after selling two-thirds of them, there are still 30 left, how many watermelons did Uncle Zhang pick in total? Answer: 1 Two-thirds = one-third.

30 One-third = 90 (pieces) Answer: Uncle Zhang picked a total of 90 watermelons. 5. A car drives from A to B to travel 144 meters, and according to B, there are two-fifths of the whole journey. How many kilometers are A and B apart?

Answer: 1 2/5 = 3/5.

144 Three-fifths = 240 km

A: A and B are 240 kilometers apart.