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Solving math problems for 4th grade, page 80 VBT exercise book 2, Application of map scale (Continued), question 149 provides solutions and detailed instructions for exercises 1, 2, 3 to help students easily tackle the problems and reinforce their understanding of map scale calculations.
Solving math problems for 4th grade, page 80 VBT exercise book 2, Application of map scale (Continued), question 149
1. Solve Exercise 1 - Math workbook for 4th grade, volume 2, page 80
Problem:
Fill in the appropriate number in the blank:
Solution Method
- Convert the actual length measurement to the unit with the same measurement unit as the length on the map.
To find the length on the map, divide the actual length (in the same unit as the reduced length) by the denominator in the map scale (for example, for a map scale of 1 : 200, divide by 200).
Answer
+) 5km = 500,000cm
The length on the map is:
500,000 : 10,000 = 50 (cm)
+) 25m = 25,000mm
The length on the map is:
25,000 : 5,000 = 5 (mm)
+) 2km = 20,000dm
The length on the map is:
20,000 : 20,000 = 1 (dm)
We have the following table:
2. Solve problem 2 - Math workbook grade 4 volume 2 page 80
Problem:
The distance from point A to point B is 12km. On a map with a scale of 1 : 100,000, how many kilometers is that?
Solution method
- Convert the length of the distance to the unit of kilometers.
- With a map scale of 1 : 100,000, to find the length on the map of that distance, divide the actual length of the distance (in kilometers) by 100,000.
Answer
Convert 12km = 1,200,000cm
The distance on the map from point A to point B is:
1200000 : 100000 = 12 (cm)
Answer: 12cm
3. Solving problem 3 - Math workbook grade 4 volume 2 page 80
Problem
The school stage is a rectangle with a length of 10m and a width of 6m. An drew the stage on the map with a scale of 1 : 200. How many centimeters is each side of the stage on the map, measured in centimeters?
Solution
- Convert the length and width measurements to centimeters.
- For a map scale of 1 : 200, to find the length on the map of each side, we divide the actual length of the sides (measured in centimeters) by 200.
Answer
Convert 10m = 1000cm; 6m = 600cm
The length of the stage on the map is:
5 (cm)
The width of the stage on the map is:
3 (cm)
Answer: Length 5cm; Width 3cm
You are currently viewing the guidance for solving Grade 4 math problems on page 80 of VBT workbook 2, Application of map scale (continued), exercise 149. You can revisit the instructions for solving Grade 4 math problems on page 79 of VBT workbook 2, Application of map scale, or preview the instructions for solving Grade 4 math problems on page 81 of VBT workbook 2, Practice, to gain a better understanding of the lesson.
