Grade 5 Math Page 162, Multiplication

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Ngày cập nhật gần nhất: 15/4/2026

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Guide to Solving Grade 5 Math Page 162, Subtraction

Solving Grade 5 Math Page 162, Multiplication provides a guide on how to solve exercises from 1 to 4. We hope that through this document, students can quickly grasp various multiplication-related problem types, making math solving easier.

=>Solve Math Exercises Grade 5 Page 162: Multiplication Practice
=>Solve Math Exercises Grade 5 Page 162: Multiplication Review
=>Refer to Detailed Grade 5 Math Solutions here: Grade 5 Mathematics Solutions

Guide to Solving Grade 5 Math Page 162, Subtraction

Question 1: Page 162 Grade 5 Math Textbook
Calculate

Solution

Question 2: Page 162 Grade 5 Math Textbook
Mental calculation:

Solution Guide:

- To multiply a decimal by 10,100,1000,... simply move the decimal point of the number to the right by one, two, three,... digits respectively.

- To multiply a decimal by 0.1, 0.01, 0.001,... simply move the decimal point of the number to the left by one, two, three,... digits respectively.

Answer:

Question 3: Page 162 Grade 5 Math Textbook
Calculate using the most convenient method:
a) 2.5 x 7.8 x 4; b) 0.5 x 9.6 x 2;
c) 8.36 x 5 x 0.2; d) 8.3 x 7. 9 + 7.9 x 1.7;

Solution Guide:

Apply the properties of multiplication such as:

Commutative property: a×b=b×a

Associative property: (a×b)×c=a×(b×c)

Multiply a sum by a number: (a+b)×c=a×c+b×c.

Answer

Question 4: A car and a motorcycle start at the same time and travel in opposite directions. The car travels from point A at a speed of 48.5 km/h, and the motorcycle travels from point B at a speed of 33.5 km/h. After 1 hour 30 minutes, the car and the motorcycle meet at point C. How long is the distance AB in kilometers?

Solution Guide:

According to the problem, we have the motion of two vehicles moving in opposite directions and starting at the same time. Therefore, to solve this problem, we can proceed as follows:

- Calculate the total velocity of the two vehicles.

- Calculate the length of distance AB = total velocity of two vehicles × time taken for the two vehicles to meet.

Answer

The distance traveled by the car and the motorcycle in 1 hour is:

48.5 + 33.5 = 82 (km)

The time for the car and the motorcycle to meet is:

Convert: 1 hour 30 minutes = 1.5 hours.

The length of distance AB is: 82 x 1.5 = 123 (km).

Answer: 123km.

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Here is the solution for Grade 5 Mathematics page 162 in the section solving math exercises for Grade 5. Students can review the solution for Grade 5 Mathematics pages 160, 161 previously solved or preview the solution for Grade 5 Mathematics page 162, Practice to improve Grade 5 Math skills.

Frequently Asked Questions

How do you multiply a decimal by 10, 100, or 1000?

To multiply a decimal by 10, 100, or 1000, move the decimal point to the right by one, two, or three places, respectively. This increases the value of the decimal.

What is the best method to multiply decimals like 2.5 x 7.8 x 4?

For problems like 2.5 x 7.8 x 4, use the commutative and associative properties of multiplication. Rearrange the numbers to simplify calculations and multiply in convenient steps.

How do you calculate the distance between two moving vehicles in opposite directions?

To calculate the distance between two vehicles moving in opposite directions, add their speeds, then multiply by the time taken for them to meet. For example, 82 km/h x 1.5 hours = 123 km.

How do you solve problems involving the multiplication of a sum by a number?

To solve such problems, use the distributive property. For example, (a + b) x c = a x c + b x c, breaking down the sum and multiplying each term separately.

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