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Guide to solving 4th-grade math on page 139 with concentrated practice (including solving methods)
1. Solve math problem 4 page 139, exercise 1 in the textbook
Solution method:
- For fractions that are not in simplest form, simplify them by dividing both the numerator and denominator by a natural number other than 1.
- After simplifying the fractions, compare them and draw conclusions.
2. Solve 4th-grade math on page 139 with concentrated practice
Problem:
Class 4A has 32 students evenly divided into 4 teams. Ask
a) What fraction of the total number of students in the class do 3 teams account for?
b) How many students are there in 3 teams?
Solution Method:
- For part a): 3 groups will account for 3/4 of the total students as the class is evenly divided into 4 groups.
- For part b): Calculate the number of students in 3 groups by multiplying the total number of students in the class by 3/4.
Answer:
a) 3 groups represent 3/4 of the total number of students in the class.
b) The number of students in 3 groups is:
32 x 3/4 = 24 (students)
Answer: a) 3/4 of the number of students
b) 24 students
3. Solving a 4th-grade math problem on page 139
Problem Statement
The distance from Mr. Hải's house to the town is 15 km. Mr. Hải travels from home to the town, and when he has covered 2/3 of the distance, he stops to rest for a while. How many more kilometers does Mr. Hải have to travel to reach the town?
Solution Method:
- Calculate the distance Mr. Hải has traveled by multiplying the distance from his house to the town by the fraction of the distance he has covered.
- Calculate the remaining distance for Mr. Hải by subtracting the distance he has traveled from the total distance from his house to the town.
4. Solving a 4th-grade math problem on page 139
Problem Statement:
There is a fuel depot. The first time they took out 32,850 liters of fuel, and the next time, they took out 1/3 of the first time. The depot had 56,200 liters of fuel remaining. How many liters of fuel were there initially in the depot?
Solution Method:
- Calculate the amount of fuel taken out the second time by multiplying the amount of fuel taken out the first time by 1/3 (because the second time is 1/3 of the first time).
- Calculate the initial amount of fuel in the depot by adding the amount of fuel taken out the first time, the amount taken out the second time, and the remaining amount of fuel in the depot.
Answer:
The amount of fuel taken out the second time is:
32850 x 1/3 = 10950 (liters)
The initial amount of fuel in the depot is:
32850 + 10950 + 56200 = 100,000 (liters)
Answer: 100,000 liters
Concise Guide to Solving 4th-grade Math Problem on Page 139
* Solving Exercise 1 in Math Book 4 Page 139
Problem Statement::
Answer:
* Solving Exercise 2 in 4th-grade Math Book on Page 139
Problem Statement::
Class 4A has 32 students evenly divided into 4 groups. Ask
a) How many percentage of the students in the class do 3 groups represent?
b) How many students are there in 3 groups?
Answer:
* Solving Exercise 3 in 4th-grade Math Book on Page 139
Problem Statement::
Answer:
* Solving Exercise 4 in 4th-grade Math Book on Page 139
Problem Statement::
There is a gasoline depot. The first time they took out 32,850 liters of gasoline, and the next time, they took out 1/3 of the first time. How much gasoline is there in the depot?
Answer:
Analysis:
- To find out the initial amount of gasoline in the depot, what do we do? (Take the first-time gasoline, add the second time, then add the remaining gasoline).
- Do we know the amount of gasoline taken the first time? (Yes, we do).
- Do we know the amount of gasoline taken the second time? (No, we don't). To find the amount of gasoline taken the second time, what do we do? (Divide the amount of gasoline taken the first time by 3).
- Do we know the remaining amount of gasoline? (Yes, we do).
We have:
Above is the detailed solution, the method of solving 4th-grade math on page 139 of the focused practice. Hopefully, the information in this article will be helpful for the 4th-grade math learning process. For further review and solidifying lesson knowledge, you can refer to the solution to 4th-grade math on page 138 or preview the solutions on pages 140 and 141 to master the material and excel in 4th-grade math.
