Solve Exercise 4 on pages 138 and 139 of Math Textbook 4

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Ngày cập nhật gần nhất: 1/5/2026

Exercise 4 on pages 138 and 139 of Math Textbook 4 is part of the Concentration Practice, How many parts of the tank are still without water?

Guidelines for solving Exercise 4 on pages 138 and 139 of Math Textbook 4

Problem:
A faucet is pouring water into a tank with no water. The first time it fills 3/7 of the tank, the second time it fills another 2/5 of the tank. How many parts of the tank are still without water?

Solution Method:
We consider the tank filled with water as one unit.
- Step 1: Calculate the number of parts of the tank with water by adding the parts filled during the first and second pours.
- Step 2: To find out how many parts of the tank are still without water, subtract the number of parts with water from the total.

Above is the guidance for solving Exercise 4 on pages 138 and 139 of Math Textbook 4, focusing practice. Additionally, this section includes 4 other exercises: Solve exercise 1 on pages 138 and 139 of Math Textbook 4, Solve exercise 2 on pages 138 and 139 of Math Textbook 4, Solve exercise 3 on pages 138 and 139 of Math Textbook 4, and Solve exercise 5 on pages 138 and 139 of Math Textbook 4. Let's check out the guidance for solving math problems on pages 138 and 139 to excel in 4th-grade math!

Frequently Asked Questions

What are the steps to solve Exercise 4 in Math Textbook 4?

To solve Exercise 4, first, calculate the total amount of water filled by adding 3/7 and 2/5. Then, subtract this sum from 1 to determine the parts of the tank still without water.

How do I determine how many parts of the tank remain empty?

You can find the empty parts by adding the fractions filled with water during the two pours and subtracting this total from 1, which represents the full tank.

What is the focus of the exercises on pages 138 and 139?

The focus of the exercises on these pages is to provide concentrated practice on fraction addition and problem-solving related to tank capacity, enhancing understanding of basic math concepts.

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