Fraction multiplication and division, for the fifth grade, there are also fractional equations and f

1. (1) Grandpa raised 12 white rabbits, which were gray rabbits. How many grey rabbits does grandpa have?

2) Grandpa raised 12 white rabbits, and the gray rabbit was a white rabbit. How many grey rabbits does grandpa have?

3) Grandpa raised 12 white rabbits, more than gray rabbits. How many grey rabbits does grandpa have?

4) Grandpa raised 12 white rabbits, and the gray rabbit was more than the white rabbit. How many grey rabbits does grandpa have?

5) Grandpa raised 12 white rabbits, which is less than gray rabbits. How many grey rabbits does grandpa have?

6) Grandpa raised 12 white rabbits, and there were fewer gray rabbits than white rabbits. How many grey rabbits does grandpa have?

2. Zhao Ming read the book "Camel Xiangzi", and read 88 pages on the first day, which happened to be the book, and read the book on the second day, and finished it on the third day. How many pages were read on the third day?

3. Young Pioneers collect animal and plant specimens. We boys collected 95 specimens, accounting for the total number of specimens, how many specimens did we girls collect?

4. The school has 320 general reading materials, accounting for 25 of the total books, how many books are there in the library? Storybooks make up 34 of all books, how many storybooks are there?

5. There are 120 pear trees in the orchard, 98 of the apple trees are pear trees, and 59 of the peach trees are pear trees. How many apple trees and peach trees are there?

6. A rail of 34 meters weighs 120 tons, how many tons does a 50-meter rail weigh?

7. The original price of a suit is 800 yuan, how much is the current price after a 20% discount? A set of sportswear is sold for 240 yuan after a six-fold discount, how much is the original price?

8. After a steel creep is cut off 8 meters, the remaining part is more than 2 meters longer than the original length, how many meters is the original length of this steel bar?

9. Fifth grade students subscribe to the "Primary School Mathematics Newspaper". The number of copies for five (1) classes is equal to that of five (2) classes. Five (1) class ordered 20 copies, five (2) class how many copies?

Intelligence competition: A, B, C, D four numbers, A number is the sum of the other three numbers, B number is the sum of the other three numbers, C number is the sum of the other three numbers, known D number is 260, what is the sum of the four numbers? What is the number of nails?

1. Oral arithmetic.

Second, the calculation of the answer to the jujube can be simple and simple.

3. Solve the equation.

3 8x+1 4 = x- 1 7 x = 3 16 Demolition x-40%x=40

4. Fill in the blanks.

2.The reciprocal of 3 2 is ( ) 10 and ( ) are the reciprocal of each other.

The sum of 1 7 is ( ) 3 meters of 1 8 is equal to 1 meter of ( ).

The reciprocal of 1 2 is ( ) and the reciprocal of ( ) is ( ).

1 6 is ( ) 8 9 is 72.

6.The reciprocal of a number is 7 12, and the 5 6 of this number is ( ).

7.( is the reciprocal of itself, ( does not have a reciprocal.)

There are ( ) 5 6 in it.

9.The product of two factors is 28, one factor is 7 12, find the other factor, and the column formula is ( ).

10.A number of 5 8 is 4, and the number 8 9 is ( ).

11.(The 3-4 of the is the smallest two-digit number.)

1 2 equals 36 ( ).

5. True/False Questions.

and 1 have no countdown. (

2.The reciprocal of the true fraction must be greater than 1. (

3.The 1 3 of the number A is less than the 1 4 of the number B (A and B are non-zero natural numbers), then the number A must be less than the number B. (

4.A number divided by a false fraction, the quotient must be greater than the number divided. (

Fraction multiplication and division application questions vs. practice question 4

1. 145 trees were planted in the fifth grade, 20 more trees were planted in the fifth grade than in the sixth grade, and how many more trees were planted in the fifth grade than in the sixth grade?

2. 145 trees were planted in the fifth grade, 20 more trees were planted in the fifth grade than in the sixth grade, and how many fewer trees were planted in the sixth grade than in the fifth grade?

3. There are 72 new schoolbags in the stationery store, the first day to sell this batch of schoolbags, the second day to sell the first day, the second day to sell how many schoolbags?

4. Xiao Ming read a book, read half of it on the first day, read the whole book on the second day, and there are still 24 pages left to read, how many pages are there in this book?

5. Xiao Ming read a 240-page storybook, read it on the first day, read the rest on the second day, how many pages are left unread?

6. There is a barrel of oil, the first time the total number is taken out, the second time the total number is taken out, and the second time is more than the first kilogram. How many kilograms are taken out for the first time?

7. There are 400 chickens in the feedlot, 100 less than the number of hens, and how many hens are raised in the feedlot?

8. The ratio of the number of three internal angles of a triangle is 3:4:5, what are the degrees of each of the three internal angles of this triangle?

9. Make a rectangular frame with 120cm wire. The ratio of length, width, and height is 3:2:1, what is the length, width, and height of this cuboid?

10. Make a rectangle with 120cm wire, the ratio of length to width is 3:2, what is the area of this rectangle?

11. The ratio of number A to number B is 2:3, the ratio of number B to number C is 4:5, what is the ratio of number A to number C? 14. Xiao Ming read a book, read half of it on the first day, read 1 4 of the whole book on the second day, and there are 24 pages left to read, how many pages are there in this book?

I don't see the problem, please be more detailed.

1. Find the fraction of a number and use multiplication; 2. Find how many fractions of a number is another number, and use division; 3. If you know what the fraction of a number is, find this number and use division (see textbook).

In layman's terms, division is used to find the fraction and unit 1, and multiplication is used to find the corresponding quantity (comparative quantity) of the fraction.

The key to solving this kind of problem is to first find out the unit 1 accurately, and then find out the fraction corresponding to the comparator, and then determine the calculation method. Here are some examples:

The actual investment is 37.6 million yuan, which is 1 9 less than the plan, and how many yuan is the planned investment?

Analysis: Find a ...... in the questionLess (more) is followed by the ,...... of the scoreis Unit 1Therefore, the planned investment ( corresponds to Unit 1

Planned Investment- Actual Investment corresponds to 1 9

Actual investment (37.6 million yuan) corresponds to 1-1 9 columns: 3760 (1-1 9).

This kind of problem is best to draw a line diagram to show it intuitively, it is easier for students to accept, I have just started to contact the Internet, I can't show it here, I'm sorry, I'm smiling.

The method of dividing multiplication and division in the fifth grade fraction application question is as follows:

1. Identify the key sentences in the question. (The question that contains the fraction)2 determines the amount of unit 1.

3 According to: the quantity of unit 1 x the fraction of the comparative quantity, find the quantity of unit 1 using the equation or division, and find the comparative quantity using multiplication.

For example, the number of safflowers is 1 2 of yellow flowers. Here the number of yellow flowers is regarded as the unit 1, if the number of yellow flowers is known, the number of red flowers is required, and multiplication; If you know the number of safflowers, you need the number of yellow flowers, so you can use division or equations.

If the number of A is reduced to the original 1 10, then the ratio of the numbers A and B is 1:1, that is, B is A's.

Let A be 10x and B be x

10x+x=

11x=x=B.

A is 18

It depends on the specific topic and specific analysis.

1 A factory plans to produce 1,200 pieces of small farm tools, and 150 pieces are produced per day in the first 4 days, and the remaining requirements are completed in 3 days. How many small farm tools are produced per day on average? (8 points).

To ask for an average number of pieces to be produced per day, you must first find out:

Write a quantity relation that is relevant to the topic:

Column comprehensive formula, no need to calculate:

2 A pile of coal, planned to burn 2 tons per day, can be burned for 30 days, the actual saving of tons per day, how many days can it actually be burned?

To ask for how many days it can actually be burned, you must first ask:

Write a quantity relation that is relevant to the topic:

Column comprehensive formula, no need to calculate:

3 ab The distance between the two places is 300 kilometers, and it takes 5 hours for car A to complete the journey, and car B to complete the journey in hours. How many kilometers per hour is car A slower than car B? (8 points).

Write a quantity relation that is relevant to the topic:

Column Integrated Answer:

2. The following questions are only columns and are not counted (12 points).

1 3 tractors per hour to plough hectares. How many hectares does each tractor plough per hour? (in two ways) (8 points).

2 kilograms of apples cost 16 yuan, and 2 kilograms of oranges cost 16 yuan. How many times is the unit price of oranges compared to apples? (4 points).

3. Answer the following questions. (64 points).

1.One fountain pen costs RMB, and three ballpoint pens cost RMB. How much is a ballpoint pen cheaper than a pencil?

2.Aunt Wang bought back 400 grams of cordyceps sinensis and packed it in small bags. If each sachet contains 30 grams. How many pouches should I prepare at least? (The number is kept as an integer).

3.Shimonoseki Kindergarten bought 380 meters of cloth to make children's uniforms. How many sets of bumi can be made for each set of children's garden? (The number is kept as an integer).

4.A worker makes 15 parts in 1 hour, how many parts are made in 12 hours of the same worker?

5.A car is driving from A to B. Travel 45 kilometers per hour and arrive in hours. How many kilometers per hour did you travel on average?

6.The grain store brought in 50 bags of rice and 40 bags of flour, each with 25 kilograms of rice and 20 kilograms of flour per bag. How many kilograms of rice are shipped than flour?

7.Qingfeng Pesticide Factory bagged 3,000 kg of pesticides. First 500 bags of 50 kg each. The rest is packed in small bags of 25 kg each. Is 250 sachets enough?

8.Wang Yong's family has a family of 5 people, and in September, electricity is 250 kWh, and each kilowatt-hour of electricity is paid. How much is the average electricity bill payable per person in September?