

Maps and Scale Drawing
Presentation
•
Mathematics
•
6th - 8th Grade
•
Hard
Joseph Anderson
FREE Resource
9 Slides • 2 Questions
1
Scale Drawing and Models
Lesson 7.5
2
Vocabulary
A scale model/scale drawing is an object or drawing with lengths proportional to the object it represents.
The scale of a model or drawing is the ratio of a length on the model or drawing to the actual length of the object being modeled or drawn.
3
Map Reading
The scale on a map relates the size of an object on the map to its actual size.
Where do you find the scale on a map/drawing?
You have a scale drawing of a boat. The length of the boat on the drawing is 3 cm. What is the actual length of the boat?
4
Map Scales
The map distance is about 1.6 cm from Charlotte to Winston-Salem.
Use a proportion to find the actual distance. Let n represent the actual distance.
5
Map Scales
The distance between Boston and Chicago on a map is 9 inches. If the scale of the map is 1 inch: 95 miles, what is the actual distance from Boston to Chicago?
Write and solve a proportion. Let x represent the distance between Boston and Chicago.
6
Multiple Choice
The distance between Cheyenne, WY, and Tulsa, OK, on a map is 8 inches. If the scale of the map is 1 inch : 90 miles, what is the actual distance from Cheyenne to Tulsa?
800 miles
900 miles
630 miles
720 miles
7
Finding a Scale
Refer to the model boxcar shown. The actual length of a boxcar is 609 in. What is the scale of the model?
8
Finding a Scale
A miniature replica of a fighter jet is 4 inches long. The actual length of the jet is 12.8 yards. What is the scale of the model?
To find the scale, write the ratio of a replica length to an actual length.
9
Multiple Choice
A miniature replica of a fire engine is 9 inches long. The actual length of the fire engine is 13.5 yards. What is the scale of the replica?
1 in. : 1.5 yd
1 in. : 3 yd
2 in. : 5 yd
3 in. : 4 yd
10
Using Scale Factors
The scale factor of a drawing or scale model is written as a unit-less ratio in simplest form.
Scale factors are always written so that the model length in the ratio comes first.
11
Finding a Scale Factor
A scale model of the Sergeant Floyd Monument is 10 inches tall. The actual monument is 100 feet tall.
What is the scale of the model?
What is the scale factor?
Scale Drawing and Models
Lesson 7.5
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