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Master Grade 4 Math: Tackle the diverse problems on pages 72-73 in Cánh Diều Volume 1. Learn efficient solving methods provided by Mytour for these tasks.
Explore More Grade 4 Math:
- Unlock the Secrets: Solve Grade 4 Math in Cánh Diều book.
- Crack the Code: Solve problem on page 87 of KNTT book, Volume 1 - Exercise 25: Find two numbers with given sum and difference.
Grade 4 Math Mastery - Cánh Diều Volume 1, pages 72-73
Exercise 29: Find two numbers given their sum and difference
1. Solve Problem 1 - Cánh Diều Grade 4 Workbook Page 73
Problem:
Find two numbers with their sum and difference given as:
Solution Method:
To find two numbers given their sum and difference, you can apply one of the following two methods:
Method 1: Smaller number = (sum - difference) : 2
Method 2: Larger number = (sum + difference) : 2
Answer:
- Find two numbers given their sum and difference: 63 and 17
The larger number is: (63 + 17) : 2 = 40
The smaller number is: 40 - 17 = 23
- Find two numbers given their sum and difference: 29 and 21
The larger number is: (29 + 21) : 2 = 25
The smaller number is: 25 - 21 = 4
- Find two numbers given their sum and difference: 26 and 6
The larger number is: (26 + 6) : 2 = 16
The smaller number is: 16 - 6 = 10
- Find two numbers given their sum and difference: 58 and 38
The larger number is: (58 + 38) : 2 = 48
The smaller number is: 48 - 38 = 10
2. Solve problem 2 - Kite grade 4 book 1 page 73
Problem:
In a box, there are 12 pens, including black and blue pens. The number of black pens is 4 less than the number of blue pens. How many pens of each type are there in the box?
To find two numbers given their sum and difference, we can follow one of the two methods below:
Method 1: Smaller number = (sum - difference) : 2
Method 2: Larger number = (sum + difference) : 2
The answer is:
The answer is:
The number of black pens is:
(12 - 4) : 2 = 4 (pieces)
The number of green pens is:
4 + 4 = 8 (pieces)
Answer: 4 black pens, 8 green pens
3. Solve problem 3 - Kite grade 4 book 1 page 73
Problem:
The total age of the father and mother is 65 years. The father is 5 years older than the mother. Find the ages of the father and mother.
Solution Method:
To find two numbers given their sum and difference, we can apply one of the following two methods:
Method 1: The smaller number = (sum - difference) : 2
Method 2: Larger number = (sum + difference) : 2
Answer:
The age of the father is:
(65 + 5) : 2 = 35 (years)
My mom's age is:
35 - 5 equals 30 (years old)
The answer: Dad is 35 years old, and Mom is 30 years old
4. Solve problem 4 - Kite Class 4 Volume 1 page 73
Problem:
During the weekend, Tuấn's father took him to a tourist area. Tuấn noticed that his father paid 500,000 VND for both of them. When Tuấn asked how much the admission fee for each person was, his father replied that the adult ticket on the weekend was 100,000 VND more than the child ticket. Calculate the weekend admission prices for adults and children.
Solution:
To find two numbers when given their sum and difference, we can use one of the following two methods:
Method 1: Smaller number = (sum - difference) : 2
Method 2: Larger number = (sum + difference) : 2
Answer:
The weekend admission price for adults is:
(500,000 + 100,000) : 2 = 300,000 (dong)
The weekend admission price for children is:
300,000 - 100,000 = 200,000 (dong)
Answer: Adult ticket: 300,000 dong
Child ticket: 200,000 dong
You are currently viewing the guide for solving 4th-grade math problems on pages 72 and 73 of the Kite book, Volume 1. For problem 28, you can review the instructions in Solving 4th-grade math on pages 69, 70, 71 of Kite book, Volume 1 - Problem 28. Finding the average, or preview the instructions in Solving 4th-grade math on pages 74, 75 of Kite book, Volume 1 - Problem 30. Concentrate to better understand the lesson.
Wishing you all success in your math studies.
