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Solving Math problems for 3rd grade on pages 109 and 110 in Cánh Diều Workbook Volume 2
Solving exercises on pages 107 and 108 of Math Grade 3 Workbook Volume 2, Cánh Diều book:
Review of numbers and calculations within the range of 100,000 (continued)
1. Solve Exercise 1 Page 107 Mathematics Textbook Grade 3
Problem: Mental calculation:
Solution: Mentally calculate addition, subtraction, multiplication, and division of numbers rounded to the nearest thousand, and ten thousand.
Answers:
50,000 + 30,000 = 80,000
30,000 x 2 = 60,000
70,000 - 50,000 = 20,000
13,000 x 3 = 26,000
16,000 + 50,000 = 66,000
80,000 ÷ 4 = 20,000
34,000 - 4,000 = 30,000
28,000 ÷ 7 = 4,000
2. Solve Exercise 2 Page 107 Mathematics Textbook Grade 3
Problem: Set up and solve:
Solution:
For addition and subtraction:
- Write the numbers in a vertical column so that the numbers in the same place value are aligned.
- Perform addition and subtraction from right to left.
For multiplication and division:
- Set up the multiplication and division.
- For multiplication: Multiply from right to left.
- For division: Divide from left to right.
Answers:
3. Solve Exercise 3 Page 107 Mathematics Textbook Grade 3
Problem: Choose the letter placed before the correct answer.
Solution: Expressions with parentheses are solved by performing operations inside the parentheses first.
Answers:
a) (20,354 - 2,338) x 4 = 18,016 x 4
= 72,064
We choose answer D.
b) 56,037 - (35,154 - 1,725) = 56,037 - 33,429
= 22,608
We choose answer B.
- See more: Solve exercises on pages 109, 110 Math Grade 3 Workbook, Cánh Diều book
4. Solve Exercise 4 on Page 107 of Math Grade 3 Workbook
Problem: Mom takes 100,000 VND to the market. She spends 57,000 VND on meat and 15,000 VND on vegetables. How much money does Mom have left?
To solve this problem, follow these steps:
Step 1: Calculate the total amount of money Mom spent on buying vegetables and meat.
Step 2: The remaining amount of money Mom has is equal to the money she took to the market minus the total amount spent on buying vegetables and meat.
The answer is:
Mom spent all the money on buying vegetables and meat:
57,000 + 15,000 = 72,000 (dong)
The remaining amount for Mom is:
100,000 - 72,000 = 28,000 (dong)
Final answer: 28,000 dong.
5. Solve Exercise 5 on Page 108 of Math Grade 3 Textbook
Problem: In a library, there are 2,638 books written in Vietnamese. The number of books written in Vietnamese is 705 more than the number of books written in foreign languages. How many books are there in total, including both Vietnamese and foreign languages?
To solve this problem, follow these steps:
Step 1: Calculate the number of books written in a foreign language.
Step 2: The total number of books written in Vietnamese and a foreign language in the library is equal to the number of books written in Vietnamese plus the number of books written in a foreign language.
The answer is:
The library has the number of books written in a foreign language:
2,638 + 705 = 3,343 (books)
In the library, the total number of books written in Vietnamese and a foreign language is:
2,638 + 3,343 = 5,981 (books)
Final answer: 5,981 books.
6. Solve Exercise 6 on Page 108 of Math Grade 3 Textbook
Problem: Each set of clothes requires exactly 3 meters of fabric. If a clothing company has 10,250 meters of fabric, what is the maximum number of sets of clothes it can make, and how much fabric is left?
To answer the question in the problem, perform the division 10,250 : 3.
The quotient of the division is the maximum number of clothing sets that can be made.
The remainder is the amount of fabric left over.
Answer:
We have: 10,250 ÷ 3 = 3,416 (remainder 2).
So, the clothing company can make a maximum of 3,416 sets of clothes and has 2 meters of fabric left.
7. Solve Exercise 7 on Page 108 of Math Grade 3 Textbook
Problem: Meo Vac is a highland district in Ha Giang province. Meo Vac district has many traditional cultural customs and magnificent natural landscapes such as the cat ear-shaped rock range, Ma Pi Leng peak, etc. As of April 1, 2019, the population of Meo Vac district is 86,071 people.
Round the population of Meo Vac district to the nearest thousand as of April 1, 2019.
Solution: Determine which thousand each given number is closer to and draw a conclusion.
Answer:
Rounding the number 86,071 to the nearest thousand, we get 86,000 (because 86,071 is closer to 86,000 than 87,000).
So, as of April 1, 2019, the population of Meo Vac district is approximately 86,000 people.
Solve exercise on pages 107 and 108 of Math Grade 3 Workbook Volume 2, Sky Wings book has provided detailed instructions to help students reference and improve their math skills.
