Proportions and Scale Factor
Presentation
•
Mathematics
•
7th Grade
•
Hard
Joseph Anderson
FREE Resource
8 Slides • 3 Questions
1
scale and scale factor
2
Scale drawings and models
To solve scale problems, use a proportion!
3
Set up a Scale proportion
write the word ratio of units
make the first ratio the scale
put the numbers from the problem in the appropriate place in the proportion
4
5
Multiple Choice
A scale drawing has a scale of 1cm:2ft. What is the actual width of a pool if it is 6cm on the drawing?
3ft
6ft
12ft
6
To find the scale
write the word ratio
put 1 over x for the scale ratio
put the numbers from the word problem in the second ratio
solve the proportion algebraically
7
8
Multiple Choice
A model ship is 30cm long and the actual ship is 150m long. What is the scale?
1cm:5m
1cm:3m
1cm:50m
1cm:150m
9
To find the scale factor
use conversions to write the scale with matching units (use a proportion)
the scale factor is the ratio written without units
10
11
Multiple Choice
The scale in an advertisement is 1in:6ft. What is the scale factor?
1:72
1:6
1:36
1:12
scale and scale factor
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