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Solving 4th-grade math problems on page 9 of VBT Exercise 2, Square Kilometers, Exercise 91 is a helpful math resource. Students can refer to this to visualize the methods, compare, and cross-check their work.
Solving 4th-grade math problems on page 9 of VBT Exercise 2, Square Kilometers, Exercise 91
Solving Exercise 1 - Math Exercise Book for Grade 4 Exercise 2, Page 9
Task:
Fill in the blanks with appropriate numbers or words:
Read: Four hundred twenty-five square kilometers
Write: ...
Read: Two thousand nine hundred square kilometers
Write: ...
Read: ...
Write: 921km2
Read: ...
Write: 324,000km2
Solution Method
To read or write area measurements, first read or write the numerical value, then read or write the unit of area measurement.
Answer
Read: Four hundred twenty-five square kilometers
Write: 425km2
Read: Two thousand nine hundred square kilometers
Write: 2090 square kilometers
Read: Nine hundred twenty-one square kilometers
Write: 921 square kilometers
Read: Three hundred twenty-four thousand square kilometers
Write: 324,000 square kilometers
2. Solve Exercise 2 - Math Exercise Book for Grade 4 Exercise 2, Page 9
Task:
Write the appropriate number in the blanks
9m2 = 900dm2
600dm2= 6m2
4m2 25dm2 = 425dm2
500cm2 = 5dm2
3km2 = 3000000m2
5 000 000m2 = 5km2
Solution Method
Based on the conversion method:
1km2 = 1000000 square meters
1m2 = 100 square decimeters
1dm2 = 100 square centimeters
Answer
9m2 = 900 square decimeters
600 square decimeters = 6m2
4m225dm2 = 425 square decimeters
500 square centimeters = 5 square decimeters
3km2 = 3,000,000 square meters
5,000,000 square meters = 5 square kilometers
3. Solve Exercise 3 - Math Exercise Book for Grade 4 Exercise 2, Page 9
Task:
A rectangular industrial zone is built on a piece of land with a length of 5km and a width of 2km. What is the area of that industrial zone in square kilometers?
Solution Method
Apply the formula: Area of rectangle = length x width.
Answer
The area of the industrial zone is:
5 x 2 = 10 (km2)
Answer: 10km2
4. Solve Exercise 4 - Math Exercise Book for Grade 4 Exercise 2, Page 9
Problem:
Mark (x) in the blank box below the appropriate number to indicate:
Solution Method:
Based on practical knowledge to predict the area of a book page or the area of Hanoi Capital.
Answer:
Here is the guidance for solving Math Exercise Book for Grade 4, Exercise 2, page 9, Square Kilometers, Exercise 91. Please continue reading the instructions for Solving math problems for grade 4, page 10 VBT Exercise 2 Practice, Exercise 92 or view the exercise Solving math problems for grade 4, page 8 VBT Exercise 2, General practice, Exercise 90 to reinforce your knowledge.
