The sum and difference of two numbers are known, and the application problem of finding out what these two numbers are is called sum and difference application problem. The following are the application problems of neutralization and difference in primary school mathematics that I collected and sorted out, hoping to help you!

The basic quantitative relationship to solve this kind of application problem is:

(sum+difference) ÷ 2 = large number

(sum and difference) ÷ 2 = decimal

The key to solving the application problem of sum and difference is to choose the appropriate number as the standard and try to turn several unequal numbers into equal numbers. Some complex application problems do not directly tell us the sum and difference of two numbers. We can find their sum and difference through transformation, and then solve them according to the solution of the sum and difference problem.

Introductory question:

1, two piles of stones * * * have 800 tons, and the first pile is 200 tons more than the second pile. How many tons are there in each pile?

Huang He is 23 years old this year. Four years later, Huang Bi was three years older. How old is Huang He this year?

3. Circle the 84cm-long iron wire into a rectangle, so that the length is 6cm more than the width. How many centimeters are the length and width?

4. There are 90 bags in two boxes of washing powder A and B. If 4 bags are taken out of box A and put into box B, the number of bags in the two boxes of washing powder is equal. How many bags are there in each of the two boxes of washing powder?

5. Among Xiaodong's books, 58 are not story books and 42 are not popular science books. Xiaodong has 60 story books and science books. How many books does Xiaodong Technology have?

Exercise questions:

1. Two years ago, Hu Wei was older than Lufei 10 years old. In three years, their age will be 42. How old are Hu Wei and Luffy?

2. Liu Xiao runs along the playground with a length difference of 40 meters every morning, running 6 times a day and running 2400 meters. What is the area of this playground?

The two baskets of bananas A and B weigh 60 kilograms. Take out 5 kilograms from one basket and put them in the B basket. As a result, basket A is 2 kilograms heavier than basket B.. How many kilograms of bananas are there in each basket?

4. There are *** 19 eggs in two cages. If you put four eggs in cage A and take two eggs out of cage B, then cage B has more 1 than cage A. How many eggs are there in each cage?

5. There are 800 bags of rice in warehouse A and warehouse B. If 25 bags are taken from warehouse A and put into warehouse B, and warehouse A has 8 more bags than warehouse B, how many bags of rice are there in each warehouse?

6. Three students deposited 500 yuan money in the bank. Now Xiaohong has taken out 50 yuan, Xiaogang has taken out 30 yuan and Xiaoli has taken out 80 yuan. At this time, Xiaohong has saved 20 yuan more than Xiao Gang and 90 yuan more than Xiao Li. How much money have each of the three people saved now?

Alternative questions:

1, the sum of the ages of Party A and Party B is 35, and Party A is 5 years younger than Party B. How old are A and B?

2. The sum of the ages of Xiao Gang and Xiao Qiang this year is 2 1 year. 1 years ago, Xiaogang was three years younger than Xiao Qiang. How old are Xiaogang and Xiao Qiang this year?

3. Circle the wire with the length of 108cm into a rectangle, so that the length is more than the width of 12cm. How many centimeters are the length and width?

4. Uncle Zhao Ran ran six laps along the swimming pool with a difference of 30 meters in length and width, doing preparatory activities before launching. * * * ran away1080m. What is the length and width of the swimming pool?

5. Weight of two barrels of oil of Party A and Party B * * * 100 kg. Take 5 kg from barrel A and put it into barrel B, and the two barrels of oil are exactly equal. How many kilograms are there in two barrels of oil?

6. There are many trees in the forest, of which 1500 is not a pine tree, 1200 is not a poplar tree, and 700 are pine trees and poplars. How many pine trees and poplars are there?

7. In six consecutive even numbers, the sum of the first number and the last number is 78. Find these six consecutive even numbers.

8. Forty-eight students in Class 4 (1) stood in four rows to take pictures, with two more people in each row than in the previous row. How many people are there in each station?

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