Exercises on pages 179, 180 of Mathematics Grade 5 Textbook, Group Practice

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Exercises on pages 179, 180 of Mathematics Grade 5 Textbook, Group Practice

Our hints for solving exercises on pages 179, 180 of Mathematics Grade 5 Textbook will be useful suggestions to assist students in revising and reinforcing knowledge about time calculation, volume calculation of rectangular boxes, as well as honing the skill of solving multiple-choice questions quickly.

Exercises on pages 179, 180 of Mathematics Grade 5 Textbook, Group Practice

Exercise 1 Mathematics Grade 5 page 179 SGK
Question:
A car travels 60km at a speed of 60km/h, then it travels 60km at a speed of 30km/h. Thus, the total time the car has traveled both distances is:
A. 1.5 hours. B. 2 hours.
C. 3 hours D. 4 hours.
Solution:
The car traveled the first distance in:
60 : 60 = 1 (hour)
The car traveled the second distance in:
60 : 30 = 2 (hours)
The total time the car traveled both distances is:
1 + 2 = 3 (hours)
=> C is the correct answer.

In the Grade 5 Mathematics curriculum, multiplying decimal numbers by natural numbers is an important topic that students need to focus on practicing fully.

After the lesson on Square Meters, we continue practicing this lesson. Hints to solve problems on pages 28, 29 will help students grasp the knowledge better.

Exercise 2 Mathematics Grade 5 page 179 SGK
Question:
A rectangular fish tank with dimensions as shown in the diagram. How many liters of water are needed to fill half of the tank?
A. 48l B. 70l
C. 96l D. 140l
Solution:
The volume of the fish tank is:
60 x 40 x 40 = 96000 (cm³)
96000cm³ = 96dm³ = 96 liters
The volume of half the fish tank is
96 : 2 = 48 (liters).
Therefore, 48l of water is needed to fill the tank.
=> A is the correct answer.
Exercise 3 Mathematics Grade 5 page 180 SGK
Question:
At the same time, Vừ rides a horse at a speed of 11 km/h, Lềnh walks at a speed of 5km/h and walks in the same direction as Vừ. It is known that when Lềnh starts walking, he is 8km away from Vừ (see the figure). How many minutes after Vừ catches up with Lềnh?
A.45 minutes B. 80 minutes
C. 60 minutes D. 96 minutes
Solution:
Every hour Vừ approaches Lềnh by kilometers:
11 - 5 = 6 (km)
The time it takes for Vừ to catch up with Lềnh is:
8:6 = 1+1/3 (hour) = 60 + 20 (minutes) = 80 (minutes)
=> B is the correct answer.

Here are hints Solving exercises from pages 179, 180 Mathematics Grade 5 textbook which have concluded the Grade 5 Mathematics part. You can review important exercises such as Solving exercises from pages 178, 179 Mathematics Grade 5 textbook and exercises on Group Practice pages 177, 178 Mathematics Grade 5 through the section Solving exercises from pages 177, 178 Mathematics Grade 5 textbook to study Grade 5 Mathematics better.

Besides the learned content, students can prepare and explore the solutions for Math 5 page 62 through detailed exercises in Solving exercises page 62 Mathematics Grade 5 textbook, Group Practice to get ahead with the upcoming curriculum.

Furthermore, Math 5 page 68 solution is a crucial lesson, hence, students should prepare Solving exercises page 68 Mathematics Grade 5 textbook, Group Practice in advance at home.

Frequently Asked Questions

What strategies can help students solve Mathematics Grade 5 exercises effectively?

Students can benefit from hints that focus on time calculations, volume calculations, and techniques for solving multiple-choice questions efficiently. These strategies reinforce their understanding and improve problem-solving speed.

How do you calculate the total time taken for a car traveling different speeds?

To find the total time, divide the distance by speed for each segment. For instance, a car traveling 60 km at 60 km/h takes 1 hour, and at 30 km/h, it takes 2 hours, totaling 3 hours.

What is the method to determine how many liters are needed to fill half of a fish tank?

Calculate the volume of the tank by multiplying its dimensions. Then, convert the volume from cubic centimeters to liters and divide by two to find how many liters are needed to fill half of the tank.

How do you determine how long it takes for one person to catch up with another while traveling?

Subtract the slower person's speed from the faster person's speed to find the rate of closing in. Then, divide the distance between them by this rate to calculate the time it takes to catch up.

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