Solve exercise 2 on page 137 of Math 5 textbook

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Ngày cập nhật gần nhất: 15/4/2026

The content of solving exercise 2 on page 137 of Math 5 textbook is within the Exercise section on pages 137 and 138, Calculate the time? It includes solutions and solving methods to provide additional helpful hints for students when dealing with exercises involving multiplication and division of time measurements.

Guidance on solving exercise 2 on page 137 of Math 5 textbook

Problem:
Calculate:
a) (2 hours 30 minutes + 3 hours 15 minutes) x 3;
2 hours 30 minutes + 3 hours 15 minutes x 3;
b) (5 hours 20 minutes + 7 hours 40 minutes) : 2;
5 hours 20 minutes + 7 hours 40 minutes : 2.

Solution method:
- When the expression contains both addition/subtraction and multiplication/division, perform multiplication/division first, then addition/subtraction.
- When the expression contains parentheses, perform operations within the parentheses first, then outside the parentheses.

Answer:
a) +) (2 hours 30 minutes + 3 hours 15 minutes) x 3
= 5 hours 45 minutes x 3
= 15 hours 135 minutes (135 minutes = 2 hours 15 minutes)
= 17 hours 15 minutes

+) 2 hours 30 minutes + 3 hours 15 minutes x 3
= 2 hours 30 minutes + 9 hours 45 minutes
= 11 hours 75 minutes (75 minutes = 1 hour 15 minutes)
= 12 hours 15 minutes

b) +) (5 hours 20 minutes + 7 hours 40 minutes) : 2
= 12 hours 60 minutes : 2
= 6 hours 30 minutes

+) 5 hours 20 minutes + 7 hours 40 minutes : 2
= 5 hours 20 minutes + 3 hours 50 minutes
= 9 hours 10 minutes

Here is the solution guide for exercise 2 on page 137 of Math 5 textbook's focused practice section. Additionally, this section includes two other exercises: Solve exercise 3 on pages 137, 138 of Math 5 textbook and Solve exercise 4 on pages 137, 138 of Math 5 textbook. Let's check out the guidance for Solve Math 5 exercises on pages 137, 138 to excel in Math class!

Frequently Asked Questions

What are the key steps to solve exercise 2 on page 137 of the Math 5 textbook?

To solve exercise 2 on page 137 of the Math 5 textbook, first perform any multiplication or division before addition or subtraction. If parentheses are present, solve those first before addressing operations outside. This order of operations ensures accurate results.

How do you calculate time using addition and multiplication in the Math 5 exercises?

To calculate time in the Math 5 exercises, convert all time measurements to minutes if necessary. Then, perform the addition of time values first, followed by multiplication as indicated in the problems, ensuring to convert back to hours and minutes if needed.

Can you explain the method for handling mixed operations in Math 5 exercises?

Yes, when dealing with mixed operations in Math 5 exercises, always perform multiplication and division before addition and subtraction. This sequence is critical for obtaining the correct answer and should be followed for all related problems.

What is the answer to exercise 2 part (a) from the Math 5 textbook?

The answer to exercise 2 part (a) is 12 hours 15 minutes. This result comes from calculating (2 hours 30 minutes + 3 hours 15 minutes) x 3, ensuring proper order of operations throughout the solution.

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