scale and scale factor

Presentation

•

Mathematics

•

7th Grade

•

Medium

•

CCSS

7.G.A.1

Standards-aligned

Jill Graham

Used 204+ times

FREE Resource

8 Slides • 3 Questions

scale and scale factor

Scale drawings and models

To solve scale problems, use a proportion!

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

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

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

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

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

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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