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Solving Math exercises for grade 3, pages 105 and 106 of Cánh Diều workbook volume 2
Solving exercises on pages 105 and 106 of Math 3 Workbook Volume 2, Cánh Diều book
Reviewing Numbers and Operations within the Scope of 100,000
1. Solve Exercise 1 on Page 105 of Math Textbook Grade 3
Exercise:
Solution Guide:
- Compare pairs of numbers with the same number of digits, starting from the left.
- Calculate sums, compare results with the number on the other side, and draw conclusions.
Answers:
2. Solve Exercise 2 on Page 105 of Math Textbook Grade 3
Exercise: Arrange the numbers 4,768; 5,189; 4,827; 5,786 in the following orders:
a) From smallest to largest.
b) From largest to smallest.
Solution Guide: Compare the 4-digit numbers and arrange them according to the requirements of the exercise.
Answers:
a) The numbers are arranged from smallest to largest: 4 768; 4 827; 5 189; 5 786.
b) The numbers are arranged from largest to smallest: 5 786; 5 189; 4 827; 4 768.
3. Solve Exercise 3 on Page 105 of Math Textbook Grade 3
Exercise: a) Write the numbers 2 894, 7 205, 5 668, 3 327 as the sum of thousands, hundreds, tens, and units (according to the template):
b) Write the following sums as numbers (according to the template):
Solution Guide: Observe the sample example to write numbers as the sum of thousands, hundreds, tens, and units, and then write the sums as numbers.
Answers:
a) 2 894 = 2 000 + 800 + 90 + 4
7 205 = 7 000 + 200 + 5
5 668 = 5 000 + 600 + 60 + 8
3 327 = 3 000 + 300 + 20 + 7
b) 4 000 + 700 + 40 + 2 = 4 742
2 000 + 600 + 40 + 8 = 2 648
5 000 + 500 + 50 + 5 = 5 555
3 000 + 900 + 8 = 3 908
4. Solve Exercise 4 on Page 105 of Math Textbook Grade 3
Exercise: Mental Calculation:
Solution Guide:
- Expressions involving only addition and subtraction are solved from left to right.
- Expressions containing parentheses are solved within the parentheses first.
Answers:
6 000 + 3 000 - 5 000 = 9 000 - 5 000
= 4 000
8 000 - 3 000 - 2 000 = 5 000 - 2 000
= 3 000
7 000 - (1 500 + 4 500) = 7 000 - 6 000
= 1 000
6 000 + 2 000 - 3 000 = 8 000 - 3 000
= 5 000.
5. Solve Exercise 5 on Page 106 of Math Textbook Grade 3
Problem: Solve the given mathematical expressions.
Solution Guide:
- Arrange the calculations for multiplication and division.
- For multiplication: Perform operations from right to left.
- For division: Perform operations from left to right.
Solution:
6. Solving Exercise 6 on Page 106 of Math Textbook Grade 3
Problem: Calculate the values of the following expressions:
Solution Guide:
- For expressions involving division and subtraction, perform division first, then subtraction.
- For expressions containing parentheses, execute operations within the parentheses first.
Answer:
a) 250 - 550 : 5 = 250 - 110
= 140
b) 350 : 7 - 6 = 50 - 6
= 46
c) 450 - (50 + 350) = 450 - 400
= 50
d) (500 + 40) x 2 = 540 x 2
= 1,080
7. Solving Exercise 7 on Page 106 of Math Textbook Grade 3
Problem: At an ocean creature museum, there were 120 visitors in the morning, and there were 30 more visitors in the afternoon than in the morning. How many visitors did the museum receive throughout the day?
Solution Guide:
Step 1: Number of visitors in the afternoon = number of morning visitors + 30
Step 2: Total visitors throughout the day = number of morning visitors + number of afternoon visitors.
Answer:
In the afternoon, there were:
120 + 30 = 150 (visitors)
Throughout the day, the museum received:
120 + 150 = 270 (visitors)
Problem 8 Solution Page 106 Mathematics Book Grade 3
Problem Statement: This year, the child is 8 years old, and the mother's age is 4 times the child's age. How much older is the mother than the child?
Solution Guide:
Step 1: Calculate the mother's age = child's age x 4.
Step 2: To find out how much older the mother is than the child, subtract the child's age from the mother's age.
Answer:
This year, the mother's age is:
8 x 4 = 32 (years old)
The mother is older than the child by:
32 - 8 = 24 (years old)
Students are encouraged to refer to the solutions on pages 105 and 106 of Math Grade 3 Workbook 2, Cánh Diều book, to better understand the methods and grasp the concepts.
