Exercise 2 Solution Page 121 Math 5 Textbook

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Ngày cập nhật gần nhất: 15/4/2026

Solving Exercise 2 Page 121 Math 5 Textbook: Volume of Rectangular Prism

Guidance on Solving Exercise 2 Page 121 Math 5 Textbook

Problem Statement: Calculate the volume of the wooden block. As shown in the figure:

Methodology: Divide the given wooden block into small rectangular prisms. Calculate the volume of each small rectangular prism using the formula: V = length x width x height. Finally, sum up the volumes of the small rectangular prisms to find the volume of the wooden block.

Answer: Method 1: Split the wooden block into two rectangular prisms A and B as shown below.

Volume of rectangular prism A: 8 x (12 - 6) x 5 = 240 (cm^3). Volume of rectangular prism B: 15 x 6 x 5 = 450 (cm^3). Volume of the wooden block: 240 + 450 = 690 (cm^3). Method 2: Split the wooden block into two rectangles C and D as shown below:

Volume of rectangular prism C: 12 x 8 x 5 = 480 (cm^3). Volume of rectangular prism D: (15 - 8) x 6 x 5 = 210 (cm^3). Volume of the wooden block: 480 + 210 = 690 (cm^3). Method 3: Volume of rectangular prism H: (15 - 8) x (12 - 6) x 5 = 210 (cm^3). Volume of the entire wooden block and rectangular prism B: 15 x 12 x 5 = 900 (cm^3). Volume of the wooden block: 900 - 210 = 690 (cm^3). Answer: 690cm^3.

Section Math 5 Exercise Solution Page 121, Volume of Rectangular Prism consists of 3 exercises. Next, the solution for exercise 2 page 121 Math 5 Textbook. Mytour provides detailed solution methods and answer keys for Exercise 1 Page 121 Math 5 Textbook and Exercise 3 Page 121 Math 5 Textbook. Students need to grasp the knowledge of this lesson thoroughly.

Frequently Asked Questions

What are the steps to calculate the volume of a rectangular prism?

To calculate the volume of a rectangular prism, divide the shape into smaller rectangular prisms, use the formula V = length x width x height for each, and then sum all the individual volumes.

How do you find the volume of a wooden block in Exercise 2?

In Exercise 2, you can find the volume of the wooden block by using various methods to divide it into smaller prisms and then summing their volumes, ultimately resulting in 690 cm³.

What formula is used for calculating the volume of a rectangular prism?

The formula used for calculating the volume of a rectangular prism is V = length x width x height, where each dimension is measured in the same unit for accurate results.

Can you explain the methodology for solving Exercise 2 in the Math 5 textbook?

Yes, the methodology involves splitting the wooden block into smaller rectangular prisms, calculating each volume using V = length x width x height, and summing these to find the total volume.

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