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Guidelines for solving exercises on pages 69,70 Math 4 including solving methods
1. Solve exercise 1 on page 69, 70 of Math Textbook Grade 4
Problem:
Solve:
a) 17 x 86; b) 428 x 39; c) 2056 x 23.
Solution Method:
Review the instructions on how to set up multiplication at Solution for Exercise 1 on page 69 Math 4 Textbook.
2. Solve exercise 2 page 69, 70 Math Textbook Grade 4
Solution Method:
Substitute each value of m into the expression m x 78, carefully calculate to find the most accurate result, then fill in the corresponding answer in the table.
3. Solving Exercise 3 on pages 69 and 70 of Math textbook for 4th grade
Problem:
Calculate the number of heartbeats of a healthy individual in 24 hours. It's approximately 75 beats per minute.
Solution method:
- Convert hours to minutes
- Find the number of heartbeats in one hour by multiplying the minutes per hour by the heartbeats per minute
- Calculate the total number of heartbeats in 24 hours by multiplying the number of hours by the number of heartbeats per hour.
Answer:
1 hour = 60 minutes.
The number of heartbeats in 1 hour is:
75 x 60 = 4500 (times)
In 24 hours, the total number of heartbeats is:
4500 x 24 = 108000 (times)
Result: 108000 times.
4. Solving Exercise 4 on pages 69 and 70 of Math textbook for 4th grade
Problem:
A store sells 13kg of sugar type A for 5200 dong per kilogram and 18kg of sugar type B for 5500 dong per kilogram. How much money does the store earn after selling all of these two types of sugar?
Solution method:
- Calculate the amount of money earned by selling 13 kg of sugar type A for 5200 dong per kilogram, by multiplying the price per kilogram by 13 kg
- Calculate the amount of money earned by selling 18 kg of sugar type B for 5500 dong per kilogram, by multiplying the price per kilogram by 18 kg
- Calculate the total amount of money earned by the store after selling all of these two types of sugar, by adding the amount earned from selling 13 kg of sugar type A and the amount earned from selling 18 kg of sugar type B.
Answer:
The amount earned by selling 13kg of sugar type A for 5200 dong per kilogram is:
5200 x 13 = 67600 (dong)
The amount earned by selling 18kg of sugar type B for 5500 dong per kilogram is:
5500 x 18 = 99000 (dong)
The total amount earned by the store is:
67600 + 99000 = 166600 (dong)
Result: 166600 dong.
5. Solving Exercise 5 on pages 69 and 70 of Math textbook for 4th grade
Problem:
A school has 18 classes, with 12 classes having 30 students each and 6 classes having 35 students each. How many students are there in total?
Solution method:
- Step 1: Calculate the number of students in 12 classes, each with 30 students, by multiplying the number of students per class by 12 classes
- Step 2: Calculate the number of students in 6 classes, each with 35 students, by multiplying the number of students per class by 6 classes
- Step 3: Calculate the total number of students in the school by adding the results of Step 1 and Step 2.
Answer:
The number of students in 12 classes, each with 30 students, is:
30 x 12 = 360 (students)
The number of students in 6 classes, each with 35 students, is:
35 x 6 = 210 (students)
The total number of students in the school is:
360 + 210 = 570 (students)
Result: 570 students.
Solving Exercise 1 on page 69 Math 4 textbook
Problem:
Set up and calculate:
a) 17 multiplied by 86;
b) 428 multiplied by 39;
c) 2056 multiplied by 23.
Answer:
Solving Exercise 2 on page 70 Math 4 textbook
Problem:
Fill in the blanks with the values of the expressions:
Answer:
Solving Exercise 3 on page 70 Math 4 textbook
Problem:
A healthy individual's heart beats about 75 times per minute. Calculate the number of heartbeats for that individual in 24 hours.
Answer:
In 1 hour, the number of heartbeats for that individual is:
75 multiplied by 60 equals 4500 (times)
In 24 hours, the number of heartbeats for that individual is:
4500 multiplied by 24 equals 108000 (times)
Answer: 108000 times.
Solving Exercise 4 on page 70 Math 4 textbook
Problem:
A store sells 13kg of sugar type A for 5200 dong per kilogram and 18kg of sugar type B for 5500 dong per kilogram. How much money does the store earn after selling all of these two types of sugar?
Answer:
The amount earned by selling 13kg of sugar type A for 5200 dong per kilogram is:
5200 x 13 = 67600 (dong)
The amount earned by selling 18kg of sugar type B for 5500 dong per kilogram is:
99000 dong
The total amount earned by the store is:
67600 plus 99000 equals 166600 dong
Result: 166600 dong
Solving Exercise 5 on page 70 Math 4 textbook
Problem:
A school has 18 classes, with 12 classes having 30 students each and 6 classes having 35 students each. How many students are there in total?
Answer:
The number of students in 12 classes, each with 30 students is:
30 multiplied by 12 equals 360 (students)
The number of students in 6 classes, each with 35 students is:
35 multiplied by 6 equals 210 (students)
The total number of students in the school is:
360 plus 210 equals 570 (students)
Result: 570 students.
In addition to the above content, you can also explore the Math 4 solving section on page 65 to enhance your knowledge of Math 4.
Furthermore, Solving Math 4 on pages 67-68 is an important lesson in the Math 4 curriculum that students need to pay special attention to.
In the Math 4 curriculum, solving exercises on page 84 Math 4 textbook (next 2 pages) is one of the very important contents that students need to focus on and improve to enhance their Math 4 solving skills.
In addition to the above content, students can also explore the solving exercises on page 84 Math 4 textbook to enhance their knowledge of Math 4.
