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Guidelines for solving exercises from page 21 Grade 5 Math including solving methods
1. Solving Exercise 1 on page 21 of Math 5 textbook
Problem:
10 people finish a task in 7 days. Now, to complete the task in 5 days, how many people are needed? (Each person works at the same rate)
Solution Method:
Summary:
7 days: 10 people
5 days: ... people?
Solution Approach:
- Find the number of people needed to complete the task in 1 day by multiplying the number of days it takes for 10 people to finish a task by 10
- Find the number of people needed to complete the task in 5 days by dividing the number of people needed to complete the task in 1 day by 5.
Answer:
To complete the task in 1 day, the number of people needed is:
10 x 7 = 70 (people)
To complete the task in 5 days, the number of people needed is:
70 : 5 = 14 (people)
Answer: 14 people.
2. Solving Exercise 2 on page 21 of Math 5 textbook
Problem:
A kitchen has enough rice to feed 120 people for 20 days, but in reality, 150 people are eating. How many days will the rice supply last? (Everyone eats the same amount).
Solution Method:
- Step 1: Calculate the number of days for one person to finish that amount of rice by multiplying the number of people by 20
- Step 2: Calculate the number of days for 150 people to consume that rice supply by dividing the number of days for one person to finish that amount of rice by 150.
3. Solving Exercise 3 on page 21 of Math 5 textbook
Problem:
To drain water from a pond, 3 pumps must work continuously for 4 hours. Since they want to finish the task sooner, they used 6 pumps. How many hours will it take to drain the pond?
Solution Method:
Apply the ratio method to solve this problem
- Step 1: Calculate the number of times 6 pumps is compared to 3 pumps
- Step 2: To find out how many hours it takes for 6 pumps to drain the pond, divide the number of hours 3 pumps work continuously by the number of times 6 pumps is compared to 3 pumps.
Concise Guidelines for solving exercises from page 21 Grade 5 Math
Solving Exercise 1 on page 21 of Math 5 textbook, Review and Supplement
10 people finish a task in:
20 x 120 = 2400 (days)
150 people will finish the task in:
2400 : 150 = 16 (days)
Chapter I introduces us to measurement units, with Hectares being prominently used. Let's explore the suggested Exercises on pages 29 and 30 of Math 5 textbook to excel in 5th-grade Math.
Solving Exercise 3 on page 21 of Math 5 textbook, Review and Supplement
To drain water from a pond, 3 pumps work continuously for 4 hours. To expedite the task, 6 pumps are employed. How many hours will it take to drain the pond completely with 6 pumps?
Solution :
Comparing 6 pumps to 3 pumps:
6 : 3 = 2 (times)
6 pumps will drain the pond in:
4 : 2 = 2 (hours)
Here is the suggestion for Solving Exercise on page 21 of Math 5 textbook, Review and Supplement with comprehensive details. Prepare for the exercise on page 21 of Math 5 textbook through Solving Exercise on page 21 of Math 5 textbook and the consolidated practice on page 22 of Math 5 textbook through Solving Exercise on page 22 of Math 5 textbook to enhance your understanding of 5th-grade Math.
In addition to the above content, you can delve into Solving Exercises on page 64 of Math 5 textbook, Practice to elevate your knowledge in 5th-grade Math.
The detailed content of solving exercises on page 66 of Math 5 textbook has been thoroughly instructed for your reference and preparation to better review 5th-grade Math.
