Buzz
Join solving exercises 1, 2, 3, and 4 in the exercise book on pages 67, 68 of 5th grade Mathematics volume 2 to reinforce knowledge, grasp solving methods related to time, and speed. Students can also refer to the document Solving 5th grade math problems on pages 67 and 68 of VBT workbook volume 2, Practice section, exercise 135 for comparison.
Solving 5th grade math problems on pages 67 and 68 of VBT workbook volume 2, Practice section, exercise 135
1. Solve exercise 1 - Exercise book for 5th grade Mathematics volume 2, page 67
Problem Statement:
Fill in the blank with the appropriate measurement:
Solution Method:
To find the time, divide the distance by the speed.
t = s : v
Answer
2. Solve exercise 2 - Exercise book for 5th grade Mathematics volume 2, page 68
Problem Statement:
A motorboat travels at a speed of 24 km/hour. How many minutes does it take for the motorboat to travel a distance of 9 km? (The speed of the water flow is negligible)
Solution Method
- To find the time the motorboat travels the distance, we divide the distance by the speed.
- Convert the time obtained into minutes.
Answer
The time taken for the motorboat to travel a distance of 9km is:
9 : 24 = 0.375 (hours)
0.375 hours = 22.5 minutes
Answer: 22.5 minutes.
The running time of the motorboat is:
9 : 24 = 0.375 (hours)
0.375 hours = 22.5 minutes
Answer: 22.5 minutes
3. Solving exercise 3 - Exercise book for 5th grade Mathematics volume 2, page 68
Problem Statement:
Uncle Ba rides a motorcycle from the countryside to the city at a speed of 40 km/hour and arrives in the city after 3 hours. If Uncle Ba travels by car at a speed of 50 km/hour, how many hours will it take him to reach the city?
Solution Method
- To find the distance from the countryside to the city, we multiply the speed of the motorcycle by the time.
- To calculate the time to travel from the countryside to the city if Uncle Ba travels by car, we divide the distance by the speed of the car.
Answer
The distance from the countryside to the city is:
40 ⨯ 3 = 120 (km)
If Uncle Ba travels by car at a speed of 50 km/hour, he will arrive in the city after the number of hours is:
120 : 50 = 2.4 (hours)
The answer is: 2.4 hours.
4. Solving exercise 4 - Exercise book for 5th grade Mathematics volume 2, page 68
Problem Statement:
A person rides a bicycle for a distance of 18.3km in 1.5 hours. How much time will it take for the person to travel a distance of 30.5km at the same speed?
Solution Method
- Calculate the speed of the cyclist by dividing the distance by the time taken.
- Calculate the time taken to travel the distance of 30.5km by dividing the distance by the speed.
Answer
The speed of the person riding the bicycle is:
18.3 : 1.5 = 12.2 (km/hour)
The time the person takes to travel the distance of 30.5km is:
30.5 : 12.2 = 2.5 (hours)
Answer: 2.5 hours
You are now viewing the instructions for Solving 5th grade math problems on pages 67 and 68 of VBT workbook volume 2, Practice section, with some exercises numbered 135. You can review the instructions for Solving 5th grade math problems on pages 66 and 67 of VBT workbook volume 2 Time or preview the instructions for Solving 5th grade math problems on pages 69 and 70 of VBT workbook volume 2, Practice to gain a better understanding of the lesson.
Wishing you success in learning mathematics.
