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Guidance on solving exercises on pages 19 and 20 of 5th-grade Math, including solution methods
1. Solve Exercise 1 on pages 19 and 20 of the 5th-grade Math textbook
Problem:
Buying 12 notebooks costs 24,000 VND. Calculate the cost of purchasing 30 notebooks.
Solution method:
- Calculate the cost of 1 notebook by dividing the total cost of buying 12 notebooks by 12
- Calculate the cost of buying 30 notebooks by multiplying the result obtained in the previous calculation by 30.
Answer:
- Buying 1 notebook costs:
24,000 : 12 = 2,000 (dong)
- If buying 30 notebooks, then it costs:
2,000 x 30 = 60,000 (dong)
Answer: 60,000 (dong)
2. Solve Exercise 2 on pages 19 and 20 of the 5th-grade Math textbook
Problem:
Hà bought two sets of pencils for 30,000 VND. If Mai wants to buy 8 pencils like that, how much does she have to pay the seller?
Solution method:
- Each set contains 12 pencils => The total pencils in 2 sets is 12 multiplied by 2
- Calculate the cost of 1 pencil by dividing the total cost of two sets by 24
- Calculate the cost of buying 8 pencils in this way by multiplying the price of 1 pencil by 8.
Answer:
Two sets of pencils include:
12 x 2 = 24 (pieces)
Buying one pencil costs:
30,000 : 24 = 1250 ( dong)
Mai buys 8 pencils for:
1250 x 8 = 10,000 ( dong)
Answer: 10,000 dong.
3. Solve Exercise 3 on pages 19 and 20 of the 5th-grade Math textbook
Problem:
A school is organizing a historical site excursion for students. In the first round, they need 3 cars to transport 120 students. How many cars are needed for the second round to transport 160 students?
Solution method:
>>> Review the detailed solution for this type of problem in the Exercise 2 solution on page 19 of the 5th-grade Math textbook.
Answer:
Each car can carry:
120 : 3 = 40 (students)
The number of cars needed for the second round is:
160 : 40 = 4 (cars)
Answer: 4 cars.
4. Solve Exercise 4 on pages 19 and 20 of the 5th-grade Math textbook
Problem:
A worker is paid 72,000 VND for two days of work. If the payment remains the same, how much will the person be paid for working 5 days?
Solution method:
- Step 1: Calculate the daily wage by dividing the total payment for 2 days by 2
- Step 2: Calculate the payment for 5 days by multiplying the daily wage (result from the previous step) by 5.
- Step 3: Conclusion.
Answer:
The daily wage is:
72,000 : 2 = 36,000 (dong)
The wage for 5 days is:
36,000 x 5 = 180,000 (dong)
Answer: 180,000 dong.
Concise solution for exercises on pages 19 and 20 in 5th-grade Math
Solve Exercise 1 on pages 19 and 20 of the 5th-grade Math textbook
Buy 12 notebooks for 24,000 VND. How much does it cost to buy 30 notebooks?
Solution:
Buying 1 notebook costs 24,000 : 12 = 2,000 (dong)
Buying 30 notebooks costs 2,000 x 30 = 60,000 (dong)
Answer: 60,000 (dong)
Solve Exercise 2 on pages 19 and 20 of the 5th-grade Math textbook
Hà buys two sets of pencils for 30,000 VND. How much does Mai have to pay for 8 pencils like that?
Solution:
Two sets of pencils include: 12 x 2 = 24 (pieces)
Buying 1 pencil costs 30,000 : 24 = 1,250 (dong)
Mai buys 8 pencils for 1,250 x 8 = 10,000 (dong)
Answer: 10,000 dong
Solve Exercise 3 on pages 19 and 20 of the 5th-grade Math textbook
A school organizes a field trip, needing 3 cars to transport 120 students. How many cars are needed for the second round to transport 160 students?
Solution:
Each car can carry: 120 : 3 = 40 (students)
Number of cars needed for the second round: 160 : 40 = 4 (cars)
Answer: 4 cars
In Chapter I, we get acquainted with measurement units, among which Hectare is frequently used. Check out the hints for Solving Math 5 on pages 29, 30 to study Math in 5th-grade effectively.
Solving problem 4 on pages 19 and 20 of Math 5 textbook: A person, working for two days, earns 72,000 dong. If the payment remains the same, how much will the person earn for working 5 days? Solution: The daily wage is: 72,000 : 2 = 36,000 dong. The total wage for 5 days is: 36,000 x 5 = 180,000 dong. Answer: 180,000 dong.
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Here are suggestions for solving exercises on pages 19 and 20 of Math 5 textbook with detailed explanations. Prepare for the upcoming review and enhance problem-solving skills through exercises on page 21 Math 5 and Practice on page 21 of Math 5 textbook for better understanding of Math 5.
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